Looking under a microscope, you note that the cell is a prokaryote. how do you know? it lacks the cell membrane
it lacks nucleus
it lacks genetic material
it lacks cytoplasm

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Which feature would you expect to find in a population in which sexual selection depends on male competition?