Which molecule is active first during DNA replication? A. Adenine B. Helicase enzyme C. DNA ligase D. DNA polymerase

Earth's stratosphere is above Earth's protective atmosphere, having conditions that are dry and cold, have intense ultraviolet solar radiation, and vacuum-like air pressure.

How could a food web based on water be connected to food chain based on land? give an example

Describe how the systemic venous system acts as a blood reservoir to stabilize and regulate venous return to the right atrium. In your answer include details of the mechanisms that promote blood flow.

Plants are a. primary producers

How do swamps different from marshes?

What is the term for a male reproductive cell?

What happens if people keep killing sharks and who wants to stop it and how may do we kill a year

In which conditions did the water move through the cell membrane when the cell was surrounded?

What materials are filtered from the blood in the kidney

What structure brings tRNA and mRNA together