Early land animals had to return to the water to reproduce.

Which of the following crosses lipid bilayers the slowest? a. a small, b. nonpolar molecule like oxygen (O₂) a small, c. polar molecule like watera large, d. polar molecule like glucose, e. a sodium ion

2) the human genome is minimally contained in which of the following?; a) every human cell; b) each human chromosome; c) the entire dna of a single human; d) the entire human population; e) each human gene

What category of organisms can mate and produce fertile offspring

Describe the evolutionary adaptation the digestive tract of roundworms

What ocean contains most of the worlds active volcanoes?

What happens when you get scared "Half to death twice"?

Atoms of different elements combine to form

How does mRNA differ from DNA? a. mRNA contains ribose sugars; DNA contains deoxyribose sugars. b. mRNA contains the base uracil; DNA contains the base thymine. c. mRNA is single-stranded; DNA is double-stranded. d. All of the above are correct.

Type of sponge that mimic synthetic sponge

Name two roles of parenchyma cells and briefly explain how these cells are specialized for these roles