What are two ways bacteria provide nutrients to humans?

In which two layers does the atmosphere's tempature decrease as the altitude increase?

The science that seeks to understand the living world is called?

Which (if any) of the following statement regarding smallpox is not correct? if all of the statements are correct, choose the final answer. a. the vaccine is made from live vaccinia virus b. the disease is spread through respiratory droplets c.

3. Cirrus clouds a. form high in the troposphere. b. always produce precipitation. c. are made of ice crystals. d. two of the above 4. The prefix nimbo - means a. tall. b. rain. c. cold. d. snow. 5. Hail forms only in a. cumulonimbus clouds. b.

Which of the following should not be taken literally and must be understood as a whole? A. conflict B. idiom C. characterization D. interpretation

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans

What is the difference between a meteor and a meteorite? A meteor has more mass A meteorite reaches Earth and has not burned up A meteorite orbits the sun and a meteor does not A meteorite glows

Which of these was NOT characteristic of the first cells on Earth? A) anaerobic B) prokaryotic C) single-celled D) contained organelles

Which process occurs only in autotrophic organisms?

Nylon fiber is classified under which one of these headings? A. Protein B. Polyurethane C. Polyester D. Polyamide