Photovoltaic cells and hydrogen fuel cells share which of the following advantages? I. No emission of air pollutants
II. Abundance of resource
III. Inexpensive compared to other resources

A. I only
B. II only
C. I and II only
D. I, II, and III

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.