Cells that secrete a lot of substances via active transport need a lot of ___in their cytoplasm. А)endoplasmic reticulum
B)mitochondria
С)golgi apparatus
D)lysosomes
E)chromosomes

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