Which of these abiotic factors would contribute to a clumped dispersion pattern incecosystem ? select all

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

How many copies of genes do gametes have?

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f