Arteries generally carry blood full of
Options:
- (A) He
- (B) Au
- (C) O3
- (D) O2
- (E) DDT
- (F) Ni
- (G) CO2
- (H) gas
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Let's think first: Arteries generally carry oxygen-rich blood. About O2, every living thing requires oxygen in order to live. Arteries generally carry blood full of O2.... So the answer is [(D)]

Natural selection results in:
Options:
- (A) insects
- (B) root growth
- (C) Plants growth
- (D) Animal survival
- (E) animals
- (F) Plant reproduction
- (G) mammals
- (H) specialization
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Let's think first: Specialization occurs when competing species evolve different adaptations. Adaptation is the result of natural selection. Specialization is a result of natural selection.... So the answer is [(H)]

An overheated body can use water for:
Options:
- (A) metabolic reaction
- (B) dehydrating
- (C) raising their temperature
- (D) heat produced
- (E) liquid
- (F) watering plants
- (G) evaporative cooling
- (H) retaining heat
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Let's think first: Sweat wets the skin, and when it evaporates, it cools the body. Sweat is made of salt and water. The evaporation of water from the skin cools the body.... So the answer is [(G)]

Cells cannot live without what commonly occuring element found on earth?
Options:
- (A) Air
- (B) matter
- (C) Light
- (D) fossil fuel
- (E) oxygen
- (F) carbon
- (G) sunlight
- (H) water
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Let's think first: Cells cannot survive without oxygen. Survival is to live, to live means hope. Cells cannot live without oxygen.... So the answer is [(E)]

What is an arthopod with two wings?
Options:
- (A) rare
- (B) fly
- (C) two
- (D) host
- (E) Aves
- (F) male
- (G) bird
- (H) bats
--
Let's think first: Most arthropods are insects. Flies are insects with two wings. Flies are arthropods with two wings.... So the answer is [(B)]

Adult sponges produce sperm and what other sex cell?
Options:
- (A) testicles
- (B) it needs them
- (C) gastropod shells
- (D) fertile
- (E) testosterone
- (F) zygotes
- (G) female gametes
- (H) barnacles
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Let's think first: Adult sponges produce eggs and sperm. Each ovule usually contains one egg , the female gamete or sex cell. Adult sponges produce female gametes and sperm.... So the answer is [(G)]