Rank the following from highest oxygen content to lowest: the air inside the alveoli, a working arm muscle, arteries to the arm, capillaries that supply the arm muscle.

What usually happens to the total biomass in an eco- system during succession? Does the number of species present in an ecosystem usually change as succession continues?

Rank the following biomes from least precipitation to most precipitation: coniferous forest, desert, tropical forest, temperate forest.

The lightest and heaviest flying birds are the bee hummingbird of Cuba, which weighs about $1.6$ grams, and the great bustard of Europe and Asia, which can weigh as much as $21$ kilograms. Show that the bee hummingbird produces about $0.016$ newton of lift when it flies, whereas the great bustard produces about $205.8$ newtons of lift. Which species would you expect to have proportionally larger wings? Why? The bee hummingbird and the great bustard are the lightest and heaviest flying birds, respectively. The bee hummingbird weighs less than a penny!

Suppose a species of bacteria divides once every $20 \mathrm{~min}-$ utes. You start with a single bacterium on your unrefrigerated egg-and-baloney sandwich at $8:00$ AM. Show that when you sit down to lunch at noon, there will be $4096$ bacteria on your sandwich.

List the accessory digestive organs associated with releasing secretions into the duodenum, and describe the ducts that deliver these secretions.

Which association is incorrect?
a. mouth—starch digestion
b. esophagus—protein digestion
c. small intestine—starch, lipid, protein digestion
d. liver—bile production
e. large intestine—water absorption

Ryan bought a new computer for $2,100. The value of the computer decreases by 50% each year. When will the value drop below$300?

Which ocean location would contain phytoplankton? A. aphotic zone C. ocean trench B. benthos D. photic zone

Name some of the materials that ancient people used as color pigments in cosmetics.

Predict what will happen to the hydrogen ion concentration and the $\mathrm{pH}$ of water if hydrochloric acid is added to the water.

Which one of the following is an example of an "acidic" solution?

A. Bleach

B. Soda

C. Ammonia

D. Baking soda

Air moves into the lungs when (a) the diaphragm contracts and flattens and the rib cage moves down and into the chest. (b) the diaphragm contracts and flattens and the rib cage moves up and out from the chest. $(c)$ the diaphragm relaxes and the rib cage moves down and into the chest. (d) the diaphragm relaxes and the rib cage moves up and out from the chest.

according to gottman, it is _______ that determines the happiness and success of a relationship.