Transport of materials into a cell against a concentration gradient, from low to high, requires A) water. B) energy. Eliminate C) osmosis. D) a passageway.

What happen when a piece of dna is missing

Compare hookworms and ascaris worms, include both similarities and differences

The small glaciers that exist in high mountainous areas are called?

How does predation cause stability in an ecosystem A. It prevents populations from getting too high? B. It prevents competition between species C. It decreases biodiversity in ecosystems D. It causes primary disturbance in ecosystems

What is the half-life of strontium-90?

What is least likely a description of the central nervous system

This was once a forested hillside. The county where this hill is located decided to widen the roads in the area. All of the trees and shrubs were cut down.

Some animals can produce a potassium ion concentration inside their cells that is twenty times greater than that of their environment. This ion concentration gradient is maintained by the plasma membrane.

Why are animals more likely than plants to form new species while still in the presence of the parent population?

Which is true about scientific knowledge? A. It is rarely proven wrong. B. It is not based on observation. C. It is agreed upon by all scientists. D. It changes as new evidence is found.