"Founding population arrives, biogeographic isolation occurs, genetic changes occur, reproductive isolation results" (Letter A)
Anatomical and molecular features often fit a similar pattern due to Homology. Homology is the existence of shared ancestry between two structures or genes in a different species.
A process that can cause this not to be the case is Convergent Evolution.
Convergent Evolution occurs when two unrelated species independently evolve similar traits to cope with evolutionary changes.
Answer:
The correct answer is A) differentiated cells retain all the genes of the zygote
Explanation:
A plant can be cloned from the somatic cells which shows that the differentiated cell of plants have the ability to divide and differentiate to produce a new plant. This property of the cell is called totipotency.
All the cells in plants are not totipotent but some cells under proper condition can show the property of totipotency. Totipotency property shows that the differentiated cell is having all the genes that were present in the zygote.
This property of plant cells is used by scientist in plant tissue culture to produce plants for research and other purposes. So the right answer is A.
<span>Let the equation be : at^2 + bt + c = P,
where t = time (hrs),
P = population (1000's).
When t = 1, P = 3.03.
When t = 2, P = 1.72.
When t = 3, P = 1.17.
Substitute these into the equation to obtain these 3 simultaneous equations :
a + b + c = 3.03
4a + 2b + c = 1.72
9a + 3b = c = 1.17
Solving gives :
a = 0.38,
b = -2.45,
c = 5.1.
The equation is therefore,
P = 0.38t^2 - 2.45t + 5.1
Testing with t = 0 to 6 gives the population values as provided,
so it seems to be a valid model.
At t = 9 hrs,
P = 0.38*9^2 - 2.45*9 + 5.1
= 13.83.</span>
The answer is one (1) billion tons of phytoplankton at any one time. Annually, its recorded that there is approximately 45 billion tons of phytoplankton in the ocean. Other than being a source of food for fish, they are critical in the carb9n cycle. This phytoplankton incorporates 45–50 billion tons of inorganic carbon into their cells and are the largest source of atmospheric oxygen.
