What causes the differences in physical characteristics like hair color among people?
different versions of genes
variations in DNA length
different numbers of chromosomes
variations in cell nucleus size

Plz ! cattle ranchers and dairy farmers rarely allow all of their animals to reproduce instead they practice selective breeding and only encourage the reproduction of animals with specific features. which of the following cows would a dairy farm most likely choose to reproduce? a. a cow that makes a lot of milk. b. a cow that can run quickly. c. a cow with a think, soft fur. d. a cow with large, strong hooves.

What part of the brain is highlighted in the diagram below?

What two factors does carrying capacity compare? population size and resource use population growth and resource availability resource use and time population size and time