Which of these is a basic unit of macroevolution?

individual
species
niche

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

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?

Which of the following shows the results that you would get if you tested beef using the four tests in the gizmo