When do scientists rely on estimates?

Answers

Answer 1

Answer: When they cannot obtain exact numbers.

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Compare mitosis and meiosis: please list 3 things that are unique to mitosis, 3 things thatare unique to meiosis, and 1 thing that they have in common. *

Answers

Mitosis occurs in the somatic cell, it is an equational division, mitosis is required for the repair and growth of the cell and organism consequently.

While meiosis occurs in gametes or germ cell, it is a reductional division, meiosis is responsible for the formation of sex cells as sperm and eggs in the organism.

Both mitosis and meiosis are responsible for splitting the nucleus and DNA and these are passed on to the two daughter cells formed.

Explanation:

Mitosis is the process of cell division in which the cell divides and each cell is identical to the parent cell in the context of DNA and its nature There are four phases of DNA as Prophase, metaphase, anaphase and telophase. The daughter cells formed, have diploid (2n) number of chromosomes.

While meiosis is the process of cell division in germ cells which start with one cell and ends in 4 haploid cells. Meiosis is completed in two steps as meiosis 1 and meiosis 2.

Which of the following characteristics is common to organisms in Kingdom Eubacteria? A. live without oxygen B. live in less extreme environments than most archaebacteria C. live in the hottest and coldest places on Earth D. are multicellular

Answers

B. They live in less extreme environments as Archaebacteria

Archaebacteria live in harsh environments. , in the hottest and coldest placed on earth, plus Eubacteria are single cellled.

Eubacteria, unlike Archaea, generally live in less extreme environments. They are unicellular, prokaryotic, lack nuclei, and unlike many Archaea, cannot live without oxygen.

Organisms in the Kingdom Eubacteria, also known as the domain Bacteria, are unicellular prokaryotic organisms without nuclei.

Compared to organisms in the domain Archaea, which often thrive in extreme environments, organisms in Kingdom Eubacteria generally live in less extreme environments, making option 'B' the correct answer to your question.

They are found in variety of habitats and can adapt to a broad range of conditions, but they do not typically favor the same harsh, extreme environments that many Archaea do.

They also lack the adaptation to live without oxygen seen in some prokaryotes, like certain Archaea.

Learn more about Kingdom Eubacteria here:

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Which process will result in a gain of energy in an ecosystem

Answers

Photosynthesis will result in gain of energy in an ecosystem

"Nearly all of the energy that drives ecosystems ultimately comes from the sun. Solar energy, which is an abiotic factor, by the way, enters the ecosystem through the process of photosynthesis. You can learn more than you want to know about this process in the unit on photosynthesis. Or, you could just chat with your local botanist. Everyone has one, right? The organisms in an ecosystem that capture the sun’s electromagnetic energy and convert it into chemical energy are called producers. Not to be confused with these Producers.

The name is appropriate because producers make the carbon-based molecules, usually carbohydrates, that the rest of the organisms in the ecosystem, including you, consume. Producers include all of the greenplants and some bacteria and algae. Every living thing on Earth literally owes its life to the producers. The next time you see a plant, it wouldn’t be a bad idea for you to thank it for its services...which, as you will learn in other units, go way beyond just supplying you with food.

After a producer has captured the sun’s energy and used it to grow yummy plant parts, other organisms come along and greedily gobble it up.These primary consumers, as they are called, exclusively feed onproducers. If these consumers are human, we call them vegetarians. Otherwise, they are known as herbivores.

Primary consumers only obtain a fraction of the total solar energy—about 10%—captured by the producers they eat. The other 90% is used by the producer for growth, reproduction, and survival, or it is lost as heat. You can probably see where this is going. Primary consumers are eaten bysecondary consumers. An example would be birds that eat bugs that eat leaves. Secondary consumers are eaten by tertiary consumers. Cats that eat birds that eat bugs that eat leaves, for instance.

At each level, called a trophic level, about 90% of the energy is lost. What a shame. So, if a plant captures 1000 calories of solar energy, a bug that eats the plant will only obtain 100 calories of energy. A chicken that eats the bug will only obtain 10 calories, and a human that eats the chicken will only obtain 1 calorie of the original 1000 calories of solar energy captured by the plant. When you think about this way, it would take 100 1000-calorie plants—those would be enormo plants, by the way—to produce a single 100-calorie piece of free-range chicken. You are now recalling all of the plants you have ever forgotten to water in your life and feeling really, really terrible about it, aren't you?

The relationships among producers, primary consumers, secondary consumers, and tertiary consumers is usually drawn as a pyramid, known as an energy pyramid, with producers at the bottom and tertiary consumers at the top. You can see from the example above why producers are at the bottom of this pyramid. It takes a lot of producers for higher-trophic-level consumers, like humans, to obtain the energy they need to grow and reproduce.

This is the answer to the great mystery as to why there are so many plants on Earth. We will even spell it out for you because it is so important to understand: there are so many plants on Earth because energy flowthrough ecosystems is inefficient. Only 10% of the energy in one trophic level is ever passed to the next. So, there you have it. We hope you feel fulfilled.

In addition to energy pyramid diagrams, ecosystem ecologists sometimes depict the relationship between trophic groups in a linear way, with arrows pointing from one organism to another. If there is only one producer, one primary consumer, one secondary consumer, and one tertiary consumer, this linear diagram is called a food chain. Food chains help ecologists and students visualize the interactions between organisms in an ecosystem. As always seems to be the case, it isn’t ever that simple. In fact, trophic interactions among organisms in an ecosystem are often really complex. It’s rare that an ecosystem only has one species at each trophic level. Usually, there are multiple producers that are eaten by multiple primary consumers. Some consumers eat different kinds of producers. Likewise, secondary consumers sometimes eat producers as well as primary consumers. These are known as omnivores.

These complex relationships are often depicted—if they can be figured out, that is—in a diagram called a food web. These diagrams can become messy indeed, depending on the size of the ecosystem and the number of interactions among trophic groups. If you like puzzles and biology, though, ecosystem ecology is the field for you.

Ecologists use food webs to better understand the intricate workings of the ecosystems they study. Understanding exactly who is eating whom can provide valuable information for conservation biologists as well. Such knowledge can aid in restoration efforts, species recovery projects, and preservation efforts, just to name a few instances. In any case, uncovering food webs goes a long way to understanding the first half of an ecosystem, the community.

If a child has blonde hair and both of her parents have brown hair, what does that tell you about the allele for blonde hair?

Answers

Answer:

The blonde hair would be the recessive trait and both the parents must be heterozygous dominant.

For instance, let us consider B and b the alleles of the gene responsible for the color of the hairs.

B is the dominant allele which codes for the brown color whereas b is recessive allele which codes for blonde hairs.

The phenotype of both the parents is a brown color, that is, dominant trait. They genotype would be Bb.

The cross would produce offspring with three possible types of genotypes BB, Bb, and bb in the ratio 1:2:1.

The offspring with BB and Bb genotype would have brown hair color and the offspring with bb would have blonde hair color.

this shows that the allele for blonde hair was hte recessive gene and therefore that child has a type of genetic mutation, just like any child with red hair and green eyes

A world-class cyclist training for the Tour de France increases his respiration rate while a pedaling up hills. What characteristics of life does this represent?

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They are movement, homeostasis, and energy.

How is an ecological footprint determined?

Answers

Answer:

The Ecological Footprint of a person is calculated by adding up all of people's demands that compete for biologically productive space, such as cropland to grow potatoes or cotton, or forest to produce timber or to sequester carbon dioxide emissions.

Explanation:

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