Which two domains consist only of single-celled prokaryotes?

a. Bacteria and Archaea

b. Bacteria and Eukaryota

c. Archaea and Eukaryota

d. Prokaryota and Bacteria

Which of the following is a responsibility of a scientist

The survivorship of gobies, and the fecundity of sparrows, both decline at high population densities. This is an example which phenomenon? a) density dependence b) survival of the fittest c) density independence d) degenerate evolution

The heart makes sure that oxygen taken in by the ... gets to the brain.

Imagine a world without fungi. How would their absence affect your life?

Animals take in oxygen and release it as

what is thermometric property ... ?

When fats first reach the duodenum what their presence stimulates the release of which hormone from the intestinal mucosal cell?

Ocean-dwelling chemoheterotrophic bacteria that generate energy via aerobic respiration are dependent on the presence of photoautotrophs like cyanobacteria because:

Nucleotide are composed of phosphate group, a sugar, and a nitrogenous base. DNA is made up of long strands of nucleotide. which part if the above molecule can differ between nucleotide? A. the sugar B. the phosphate group C. the nitrogen group D.

2 atp molecules are needed to start A) the krebs cycle B) gyycolysis C) the electron transport chain D) none of the above