Speciation can be difficult to observe in nature, but the it is hypothesized that the following occurs in a allopatric speciation's intermediate stage:
(1) closely related species are differentiated through geographic variation (2) then there's reduced fertility in one a geographic race of the species (3) and in the geographic race of subspecies that are to become species.
Answer:
As the cell grows, it faces some issues such as:
• Running out of the nutrients and requirement of growth factors.
• Running out of the space.
• Require appropriate gas exchange.
As compared to the smaller cells, larger cells have more issues in moving the required materials inside and excretory products outside. This is because the ratio of the surface is to volume is turning more and more unbalanced and takes much longer time for the cellular processes to take place.
Explanation:
D:viruses are not killed by antibiotics.
Answer:
A
Explanation:
an energy pyramid shows the flow of energy in the different trophic levels.
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