The figure below shows feeding relationships among some organisms in an

ecosystem. According to the evidence, which resource are some of the

organisms competing over?

Explain why earth is considered a closed system?

What is a dissecting pan used for in biology?

What type of reproduction shuffles genes? a. asexual b. binary fission c. budding d. sexual

Why is carbon considered tetravalent? A. Since it has four electrons in its outermost orbital, it needs four more electrons to complete its octet. B.

Describe how the digestive system works at the organ level.

Which of the following is true of unsaturated fats? (A) They are more common in animals than in plants. (B) They have double bonds in their fatty acid chains. (C) They generally solidify at room temperature.

How many times HCl 4 M is less concentrated than HCl 10M?

Notice that the predicted percentages and laboratory percentages are not the same. These differences most likely result from.

Which of the following is true of both starch and cellulose? a. They are both polymers of glucose. b. They are geometric isomers of each other. c. They can both be digested by humans. d. They are both used for energy storage in plants. e.

What is hybrid inviability? What is hybrid infertility?