Transport of materials into a cell against a concentration gradient, from low to high, requires



A) water.

B) energy.

C) osmosis.

D) a passageway.

Which hormone is secreted by Beta cells of islets of Langerhans?

Used by cells as an energy source?

Which type of fossil would be most likely to show the complete outline of a leaf?

Which of the fallowing shows the correct order of extent of differentiation

Why is it important to have a standard form of measurement in science?

Experiment: Water Properties: Why were the results with just water so much different than the trials with the detergent?

How do fish nets effect the ocean's ecosystem?

A dog and a pig attempt to mate. we are aware that these are two different animal species. but what is the best explanation for the barrier that makes it impossible for them to successfully mate?

How do fossils and fossil record support the idea that life changes over time

1 reason why cases of violence and abuse are not reported