Scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout Earth's history. These two events areA) global ice ages and the impact of asteroids.
B) the impact of asteroids and volcanic eruptions.
C) lack of atmospheric oxygen and volcanic eruptions.
D) global ice ages and the rise and fall of sea level.

Answers

Answer 1

Answer: Scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout Earth's history. These two events are
A) global ice ages and the impact of asteroids.
Global ice ages led to the extinction of many populations over time, whereas when asteroids hit Earth, dinosaurs disappeared, among other species.

Answer 2

Answer:

The impact of asteroids and volcanic eruptions

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Many differences in gene sequences between species, and also among individuals within a species, consist of single nucleotide polymorphisms. Choose the statement that best explains why these types of differences are among the most common DNA changes observed?

Answers

Answer:

A single nucleotide polymorphism (SNP) is the most common gene variation found among people. A SNP represents a change in a single DNA block, called a nuecleotide, being able, for example, to replace a nucleotide cytosine (C), with a nucleotide thymine (T), guanine (G) or adenine (A) in the genome. They represent the 90% of all the human gene variations.

Explanation:

________ affects greenhouse gases which creates global warming.A. sulfur dioxide
B. carbon dioxide
C. oxygen
D. nitrogen

Answers

Answer:

B. carbon dioxide is the correct answer.

Explanation:

The greenhouse effect is caused by human activities like cutting the forest and fossil fuel burning, increase the level of carbon dioxide gas(greenhouse gases) and creates global warming.

When the fossil fuel is burned carbon combines with oxygen to form Carbon dioxide and it increases the concentration of greenhouse gases and give rise to global warming.

The Greenhouse gases Carbon dioxide traps the radiating heat from the Earth, this heat is absorbed in the form of infrared radiations and the radiation is emitted which warmer the lower atmosphere and Earth surface,this result in melting of ice sheets, glaciers and warming the ocean

Thus carbon dioxide greenhouse gases which creates global warming.

Carbon Dioxide affects greenhouse gases which creates global warming

Discuss assessments of the cardiovascular and respiratory systems and identify diagnostic tools to measure the effectiveness of the systems

Answers

There are many type of diagnostic assessments used by health professionals to check the cardiovascular and respiratory body systems today. These devices tend to be focused on identifying any unusual or atypical occurrences inside these body systems.
1. Blood pressure checker

What happens in metaphase 1 in meiosis

Answers

In metaphase 1, the chromosomes are arranged on the metaphase plate and are attached onto the spindle fibers. They are in the middle of the cell and are pulled by the the spindle fibers.
Hope this helps.

I believe the stuff in the nucleus starts to pull apart and the spindle fibers appear.

At a basic level mitosis and meiosis are similar processes. However, they have very different outcomes. Which of the following statements describes an important outcome difference?A. Sister chromatids are separated in meiosis but not in mitosis.B. Sister chromatids are separated in mitosis but not in meiosis.C. Homologous chromosomes are separated in meiosis but not in mitosis.D. Homologous chromosomes are separated in mitosis but not in meiosis.E. None of the above describes a difference between mitosis and meiosis.

Answers

Answer: C. Homologous chromosomes are separated in meiosis but not in mitosis.

Explanation: There are two main types of division that take place in eukaryotic cells, mitosis, and meiosis. Mitosis is the type of division that is used for growth, repair, and replacement of tissues. Therefore it is not necessary that the cells have different chromosome numbers or are varied genetically in the daughter cells in the case of mitosis.

Meiosis is the division that takes place to form the gametes for sexual reproduction. It is important in the first stages of meiosis I, to introduce variation and to halve the chromosome number.

Chromosomes numbers are halved (from 46 to 23) during meiosis I because the gametes (sperm and egg) come together and fuse during fertilization to form a zygote. When this fusion occurs (23 from the zygote and 23 from the egg), the chromosome number needs to be returned to that of the parent cell (46).

Genetic variation is introduced during synapsis which only occurs in meiosis, not mitosis. Homologs exchange genetic information during crossing over of synapsis. Entire chromosomes also separate during meiosis I.

At the end of meiosis, four genetically unique cells are produced with half the number of chromosomes as the parent cell (23 cromosomes) . After the process of mitosis is completed, two cells genetically identical to each pther are produced and have the same number of chromosomes as the parent cell (46 cromosomes).

Genetic variation is actually important because of changing environmental conditions.

A taiga biome is DIFFERENT from a tundra biome because it has A) many coniferous trees.
B) cold winters and cool summers.
C) located in the northern hemisphere.
D) a layer of frozen soil called permafrost.

Answers

Answer:

The correct answer would be A) many coniferous trees.

Taiga and tundra represent the two coldest biomes of the land on the planet.

The average annual temperature of taiga lies between 41° Fahrenheit and 23° Fahrenheit whereas the temperature of the tundra lies below 23° Fahrenheit throughout the year.

It makes the major difference between the plant life of the two biomes. The taiga is characterized by the presence of coniferous forests which consist of spruces, pines, and larches.

In contrast, vegetation in the tundra is mainly composed of grasses, shrubs, mosses, sedges, and lichens.

the answer is A. The tundra is a frozen waste, having very little to no vegetation. While the taiga has conifers growing there

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