Robin is writing an essay on the earth's temperature. What can he write about that keeps the earth relatively warm at night?

A. ozone layer hole

B. acid rain

C. increase in sea levels

D. the greenhouse effect

E. global warming

List five major functions of epithelium in the body and give examples of cells or organs that provide each function

What patterns can be used to identify the ancestry line of an organism

Give an example of how energy from the sun gets into your cells

Snapdragons, a flowering plant popular with gardeners, can have red, white, and pink colored petals. When snapdragons with red petals (RR) are crossed with snapdragons having white (WW) petals, the offspring have pink petals.

How might the surface area to volume ratio affect the ability of a cell to take in and use nutrients from its environment?

How is an atom and element related?

What is conservation of energy

Explain the difference between plasma and the formed elements of the blood.

How far away from the Sun is the asteroid in astronomical units?

What bony structures probably became infected by the bacteria or viruses causing the cold?