Trees have woody stems covered with what?
Options:
- (A) heat energy
- (B) thin skin
- (C) protective skin
- (D) skinny cells
- (E) white skin
- (F) Chlorophyll
- (G) Organic compounds
- (H) looseness
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Let's think first: Trees have woody stems covered with bark. On the outside is a protective skin of bark made mainly of cork. Trees have woody stems covered with protective skin.... So the answer is [(C)]


Pollen consists of tiny grains that are the _ of plants.
Options:
- (A) Mitosis
- (B) made
- (C) small
- (D) sperm
- (E) seeds
- (F) honey
- (G) flowers
- (H) edible
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Let's think first: Pollen consists of tiny grains that are the male gametes of plants. Male gametes are called sperm. Pollen consists of tiny grains that are the sperm. of plants.... So the answer is [(D)]


Where do rays enter the eye?
Options:
- (A) glass
- (B) Summer
- (C) pupil
- (D) lenses
- (E) harmful
- (F) the sun
- (G) photons
- (H) skin
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Let's think first: Light enters the eye through an opening called the pupil. Light rays are focussed on the retina. When rays are shined at the eyes, they enter an opening called the pupil.... So the answer is [(C)]


What can lead to alkalosis?
Options:
- (A) metabolic reaction
- (B) Breathing too fast or too slow
- (C) Drinking too much water.
- (D) Something that causes allergies
- (E) Sleeping too much.
- (F) direct damage to the lungs
- (G) Warm air moving into cold air
- (H) Eating too much.
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Let's think first: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. Alkalosis is a blood pH above 7.45. Rate of breathing being too fast or too slow can lead to alkalosis.... So the answer is [(B)]


Plants live just about everywhere within our planet's what?
Options:
- (A) crust
- (B) solar system
- (C) state
- (D) the environment
- (E) atmosphere
- (F) moon
- (G) solar energy
- (H) vegetation
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Let's think first: Plants live just about everywhere on Earth. Air is everywhere in the earth's atmosphere. Plants live just about everywhere within the atmosphere.... So the answer is [(E)]


Populations that are biodiverse might be called:
Options:
- (A) homogenous enclaves
- (B) similar
- (C) animals
- (D) peachleaf willow
- (E) communities
- (F) bottlenecks
- (G) insects
- (H) fertile
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Communities consist of populations of different species. Biodiversity is a lot more than just the number of different plant and animal species. Communities consist of populations that are biodiverse.... So the answer is [(E)]