Natural selection act directly upon <u>Alleles</u>
Explanation:
Genes, such as that of fur color, have many variants called alleles. Natural selection act on the alleles and chooses the best fit for an environment and eliminates the disadvantageous ones from the population over generations. Mutations are a rare occurrence that increases the number of allelic variants of a genes on which natural selection can act upon.
Mesozoic, the era contained both large reptiles and small birds/mammals. It's interesting, coming from an evolutionary biology.
Hope this helped!
Secondary consumer
(In detail) A secondary consumer eats the primary consumers while the primary eats the producers. Primary consumers are herbivores while secondary consumers can be omnivores and carnivores.
Answer:
I think it might be red an white blood cells
Explanation:
red an white blood cells play a important role in transporting the proteins, minerals an oxygen all over the body through the blood vessels this is connected to the heart.
The large muscles, especially in their jaws helps to extend their tongue to catch, gather, and consume their prey (food).
Hope that helps! xD
