What is a well tested explanation that unifies a broad range of observations called

Which of these statements is correct? 1) Eukaryotic cells do not have ribosomes 2) Eukaryotic cells do not have chloroplasts 3) Prokaryotic cells do not have a cel wall 4) Prokaryotic cells do not have a nucleus

What happens to the energy absorbed during an endothermic reaction.

Which planets have evidence of water on surface? Check all that apply

A boy jumps into a cold swimming pool and his body temperature goes down. His muscles, blood vessels, and nervous system work together to restore his body temperature. Which term best describes this process? A. homeostasis B. hypothermia C. reflex D.

Biology is the study of the atmosphere. a. True b. False

Soil formation occurs in a relatively short amount of time since animals frequently cause the breakdown of rocks. Select one: True False

Certain species of what are now recognized as indicators of environmental pollution

On what two structures in your cells are your two alleles for a trait located?

When egg whites are whipped they stiffen into a meringue. the change that occurs in the protein is called?

The sudden death of brain cells when their blood supply is interrupted is called