In tree rings, like those shown, each "ring" of growth represents what?

A. Two years of growth

B. One season of growth C. One year of growth

D. One month of growth

Learning through art: dna structure can you correctly label various parts of a dna molecule?

The scientific name for the layer of gas that surrounds the earth. A. lithosphere B. hydrosphere C. atmosphere D. biosphere

This organ system removes waste products from the blood, regulates ph and water balance:

What is the result unit if you divided 1 kg • m/s2 by 1kg

The three types of hazards that make food unsafe are

Which process moves water molecules across the membrane of a cell? diffusion endocytosis exocytosis osmosis

Which of these is NOT a main type of tissue? connective skeletal nervous muscle

Which of the following is true with respect to mutagens? Mutagens are chemical or physical factors that increase the rate of mutation. Mutagens are the genes that cause mutation. Mutagens are inheritable characters that develop mutation.

Who was the first person to observe a living cell in a drop of pond water.

Biologists identify four major components in an ecosystem: producers, consumers, decomposers, and the abiotic environment. what links them?