Which one of the following pollutants is responsible for the increase in skin cancer?

A. Chlorine monoxide from automobiles

B. Polychlorinated hydrocarbons

C. Chlorofluorocarbons

D. Nitric oxide

Why does a mountain climber need an oxygen supply at very high altitudes, even though the air still contains 21% oxygen?

Which factor can be controlled to lessen a person's susceptibility to certain diseases?

Most of semen volume is composed of sperm. True or False

During the 1970s, areas of the bay were found to have low levels of oxygen and could not support life. What was the cause of this problem?

In the United States, the only two spiders with dangerous bites are the A. black widow and tarantula. B. tarantula and scorpion. C. scorpion and brown recluse. D. brown recluse and black widow.

Name the largest creature on earth.

Marking brainliest! In order for the lagging strand to elongate during DNA replication, it must A. Use short RNA primer to proceed B. progress towards the replication fork C. be synthesized in a 3' - 5' direction D.

In "no witchcraft for sale," what happens after gideon uses his medicine on teddy?

1. How is cell division different in plant and animal cells? Give at least 2 important differences.

Describe structures common to most leaves.