What is the biological pump?
a) Osmosis pushes nutrients across cell membranes, allowing the nutrients to get from the bloodstream to where they are needed by the cells.
b) Photosynthetic organisms take in carbon dioxide and give off oxygen.
c) Photosynthetic organisms use sunlight, carbon dioxide, and water to create energy.
d) The removal of nitrogen from the water by biologic productivity
e) The removal of organic matter and nutrients from surface water to deep water through the sinking of dead surface-dwelling organisms
Question 2
What are the two primary factors that control biologic productivity in the surface oceans?
a) Sunlight and temperature
b) Temperature and sunlight
c) Temperature and nutrients
d) Sunlight and nutrients
e) Sunlight and oxygen
A computer rendition of biological chromosomes (biology)
Plant cell structure
Diagram of a cell
HIV cycle in an infected cell: (a) latent infection; (b) active infection.
Membranes
Stem Cell Production