In which of the following places is it more difficult to determin if there is pollution?

Aquifer

Stream

Pond

Air

A human skin cell contains 46 chromosomes. After the cell completes the process of mitosis and the cell divides, how many chromosomes will each of the new skin cells contain?

What is a variety of living things in an area?

Name two factors that cause a decrease in population size.

How do arthropods keep from drying out

An example of a chemical change is A) burning wood. B) breaking a glass. C) folding paper into a frog. D) molding clay into a snake.

as the flames heat the gasses in the hot air ballon, the volume of the gasses increases. At constant pressure, the volume of all gasses increase with temperature. Is this statement a scientific theory or law? Explain

What is a biological entity?

Toxic waste can enter foods through the contamination of groundwater. True or False?

An organism that is heterozygous for a particular character will generally show the recessive trait. a. true b. false

Some speciea undergo long peiods of stability interrupted by geologically brief periods of signifficant change. During these brief periods, new species may evolve. This pattern of evolution is part of the concept of