BIOLOGY HIGH SCHOOL

After Darwin proposed his ideas about natural selection as a mechanism for evolution, it took time before evolution was generally considered a theory. Why do we now refer to it as a theory?

Answers

Answer 1
Answer:

Answer:

A scientific theory refers to the possible explanation of the natural event. It can be tested repeatedly and can be verified by anyone with the help of predefined sets of protocols and scientific experimentation.  

Similarly, Darwin proposed the idea of natural selection as the mechanism of evolution.  

Various experiments in labs, as well as observations made under natural conditions, proved that natural selection plays a major role in the evolution.

Examples may include industrial melanism of peppered moths, long neck of Giraffe, different shapes and sizes of beaks of Darwin finches et cetera.

This is why natural selection is considered a theory now.
Answer 2
Answer:

Answer:

It is a fact and not a theory

Explanation:

A scientific theory is some natural phenomenon that has been tried and tested several times and backed by logical and testable observations and hypotheses in a way that  in future anyone can test it. It is not a guess or hunch but a concept explained with logic and backed by solid unvarying proofs.

In case of biological evolution, observations have been made and tested several times so that no more further testing or trying is required. Hence, by this logic evolution can be considered as a fact but it can not be considered as a theory.

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Which of the following statements is true for a eukaryotic cell?A. Does not possess intracellular membrane bound organelles. Everything inside just floats freely in the cytoplasm.B. Possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes.C. Possesses simple duplex DNA in the form of a circular loop.
In his study of pea plants, Gregor Mendel used which method to produce offspring?

The _______ is a muscle in the bottom of the chest that bends downward to draw air in, and bows upward to force air out of the lungs. A. diaphram B. bronchi C. trachea D. heart

Answers

its the diaphragm. If you ever join a choir of some sort,your director will tell you to use your diaphragm to exhale air out to produce a louder and stronger sound.

Plants and animals tend to store their carbohydrates in the same forms True or False​

Answers

Answer: Plants store carbohydrates in long polysaccharides chains called starch, while animals store carbohydrates as the molecule glycogen.

Explanation:

Answer:

I think it's true

Explanation:

In those parts of equatorial Africa where the malaria parasite is most common, the sickle-cell allele constitutes 20% of the β hemoglobin alleles in the human gene pool. 15. If the sickle-cell allele is recessive, what proportion of the population should be susceptible to sicle-cell anemia under typical conditions?

Answers

Answer is "0.04 Population"

Explanation:

  • The human body is a remarkable piece of work in which every part has its own function. Each part has a specific structure to best fit its function. When everything is structured (shaped) properly, it should function properly. However, there are many times when parts of the body are misshaped, and the deformed structure no longer allows for the body to function properly
  • The function, or job, of red blood cells is to carry oxygen to all the organs in the body. They also get rid of the carbon dioxide (CO2), a poison in our bodies. They travel through a maze of blood vessels such as veins and arteries. To make for smooth travel through the body, normal red blood cells are shaped like little flexible disks. Their shape allows for them to bend and twist and move around the body in a smooth, fluid movement. Blood cells shaped like sickles can obviously not perform their function as well
  • All red blood cells have a protein in them called hemoglobin (HEE-muh-glow-bin). Hemoglobin is what attaches the oxygen to the cell. A person with sickle cell anemia has some red blood cells that have a different kind of hemoglobin called hemoglobin S. Hemoglobin S causes a red blood cell to be deformed into a sickle shape. A sickle cell is stiff and sticky instead of smooth and flexible
  • Hence the right answer is "0.04 proportion of population should be susceptible to sicle-cell anemia inder typical condition"

Is a chameleon a lizard?

Answers

Yes. A chameleon is a lizard. They belong to the family Chameleonidae.

So chameleons belong to the reptile family.
Yes a chameloen is part of the reptile family. And there ae different types of chameloen. There is one chameloen that changes colors. For defense or camouflage itself from predators.

What is the first step of DNA replication?A. Free nucleotides bond together in the correct sequence.

B. A single-stranded RNA molecule forms.

C. The DNA transfers its information to RNA through an amino acid.

D. The DNA molecule unzips along weak hydrogen bonds.

Answers

DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. The option (D) is correct.


What is DNA replication?

DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell.

Moreover, DNA must replicate (copy) itself so that each resulting cell after mitosis and cell division has the same DNA as the parent cell. All these cells, the parent cell and the two new daughter cells, are genetically identical.

Therefore, DNA replication is the process of creating two identical daughter strands of DNA. DNA replication occurs in the nucleus in eukaryotic cells and in the nucleoid region in prokaryotic cells. DNA replication occurs in S phase during the cell cycle prior to cell division.

Learn more about DNA replication:

brainly.com/question/16464230

#SPJ2

Answer:

D

Explanation:

The first step in DNA replication is to 'unzip' the double helix structure of the DNA molecule. This is carried out by an enzyme, called helicase which breaks the hydrogen bonds? holding the complementary bases of DNA together

Wildlife is plentiful in the pineywoods. There are over 100 species of birds and many small mammals, like cottontail rabbits and squirrels. What else MUST be included in the pineywoods habitat to keep populations in balance?

Answers

Answer:

Bacteria

Explanation:

Because in this situation they are discussing on which organisms are decomposers and they are bacteria.
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