What is photosynthesis​

What makes a dominant allele different from a recessive allele

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

What factors contribute to the effect an environmental toxin has on the human body?