BIOLOGY HIGH SCHOOL

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were (A) cyanobacteria
(B) archaea
(C) diatoms
(D) flowering plants
(E) mosses

Answers

Answer 1
Answer: B or A the chapter I learned talked about both

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A drastic short-term reduction of population size caused by natural disasters, disease, or predators is called:

Answers

A drastic short-term reduction of population size caused by natural disasters, disease or predators is called a bottleneck event. A bottleneck event or also known as genetic bottleneck results in the reduction of the gene pool of the population, making the current population have a low genetic diversity and high genetic deviation. Because of low genetic variation, the new population will become distinct from the original.

The answer is D. A reduction in the birth rate (edge e2020)

:)

Does the DNA in the skin cell have the same backbone as DNA in the brain cell of the same organism?

Answers

no it does not I hope this helps

Observing animal tracks is an example ofobservation, which is used to estimate population size.
A. mark and recapture
B. indirect
C. sampling
D. direct

Answers

Answer:

The answer is B. Indirect!

Explanation:

What shape are the plasmid present in Eubacteria?a. luminous

b. nuclear

c. linear

d. circular

Answers

Answer:

circular

Explanation:

Plasmids are small, circular extrachromosomal DNA molecules that replicate independently of the chromosomal DNA. They usually carry at least one type of gene that is beneficial to the host organism. They code for resistance genes in bacteria.

Answer:

Circular

Explanation:

If you wanted to learn more about the genetic material of plant and animal cells, where would you look? A.
in the lysosomes

B.
in the nucleus

C.
inside the chloroplasts

D.
on the cell wall

Answers

I would look inside the nucleus (B) - that's where DNA is located. It's also called nuclean DNA because of this. The DNA is found in Chromosomes, which are kind of "packages" of  DNA.

Why are ecological pyramids shaped as pyramids?A.Because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
B.Because the movement of energy through the biosphere follows a path similar in shape to a pyramid
C.Because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
D.Because food webs are usually triangular in shape

Answers

A.Because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
you lose 10% as you move up.
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