The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life?

A. Hydrogen

B. Helium

C. Nitrogen

D. Oxygen

Which of these is the second of the three stages of cell signaling? a gene activation b reception c binding of a neurotransmitter to a plasma membrane receptor d transduction e cell response

Which of the following is a product of photosynthesis? A. Carbon dioxide B. Sunlight C. Water D. Oxygen

What happens when the body releases perspiration? Blood flows into the kidneys. B Nephrons cool the body down. ADH increases in the blood. Water evaporates from the skin.

A vitamin/mineral supplement has this claim on the label: "Boosts immunity." What type of claim is this?

What does this mean? "There is a lot more to science than what is observed on the surface."

Forming the cell walls of stems, leaves, and roots, what compound is the primary structural constituent of plant tissues?

All microorganisms cause illness and disease? true or false

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis

What would be the effect of a mutation in the coding region of the lactase gene?

Which of the following can be said about the use of agriculture? a. It bears no effect on the environment. b. It stunted the growth of civilization and development. c. It prohibited the use of machinery. d.