What is not a characteristic of cell differentiation A) stable phenomenon
B) unstable phenomenon
C) controlled by genetic factors
D) precedes morphological difference

What process allows for the development of haploid sex cells? mitosis meiosis fertilization pollination

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?