If an atom contains 3 protons, 4 neutrons, and 3
electrons, its mass number is
a. 3.
b. 4.
c. 7.
d. 11.

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?