How many essential amino acids must be obtained from food?

What must a cell produce to make large amounts of particular protein?

Which of the following is NOT a way carbon dioxide returns to the atmosphere a. decay of organisms b. emissions by factories c. photosynthesis d. respiration

Frozen water exists on the lunar surface primarily in which location? why?

Identify which statement represents a scientific law

The way you breathe and the way your heart beat changes when you run fast. Describe both these changes. (Extended writing)

What is another name for skeletal muscle? involuntary muscle connective muscle voluntary muscle interactive muscle reactive muscle?

Water can leave the air as a result of which processes? A. infiltration or transpiration B. precipitation or evaporation C. evaporation or transpiration D. condensation or precipitation

A bird and the snake would both be classified as

Elephantiasis is caused by what

Which has a more long term consistency? (Climate or Weather)