All atoms of the same element contain the same number of

a. neutrons.

b. protons.

c. neutrons and electrons.

d. neutrons and protons.

Which describes a constant in an experiment? A. the variable changed by the experimenter B. the quantity that must remain the same C. the variable that changes in response to the experiment D. the statement that is worded to test the experiment

Where are most platues formed

What are the advantages and disadvantages tidal energy?

The number of protons plus neutrons an atom

What percentage of a lower trophic level's energy flows to the next higher trophic level? a. 1% b. 10% c. 50% d. 100%

Describe three ways in which the organs of the circulatory system and respiratory system are protected.

A reef results from life processes. True False

Why do producers make up the base of the energy pyramid

Which is the SI base unit of mass

The male reproductive system includes a. the cervix. b. the uterus. c. the vas deferens. d. the fallopian tubes.