What powers sweat?
Options:
- (A) heat produced
- (B) The body's fuel
- (C) a gas in the air
- (D) hydration
- (E) When the water is hot
- (F) air cools
- (G) matter vibrating
- (H) Cooling vapors
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Let's think first: Evaporation of sweat uses energy, and the energy comes from body heat. Energy is the body's fuel. When sweat is evaporated, the body's fuel is used.... So the answer is [(B)]

What has circulatory system with a two-chambered heart?
Options:
- (A) sharks
- (B) trout
- (C) pan
- (D) toads
- (E) Birds
- (F) animals
- (G) mammals
- (H) Man
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Let's think first: Fish have a circulatory system with a two-chambered heart. Fish species include salmon and trout. Salmon and trout have a circulatory system with a two-chambered heart.... So the answer is [(B)]

What provides food and shelter to many ocean organisms?
Options:
- (A) houses
- (B) umbrellas
- (C) limestone
- (D) ferns
- (E) sharks
- (F) barnacles
- (G) calcite
- (H) sheds
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Let's think first: Coral reefs provide food and shelter to many ocean organisms. Coral reefs are predominantly calcite. Calcite provides food and shelter to many ocean organisms.... So the answer is [(G)]

The mature form of what kind of cell secretes antibodies?
Options:
- (A) more abundant
- (B) it needs them
- (C) positive
- (D) graptolites
- (E) A Greek letter
- (F) barnacles
- (G) B-lymphocytes
- (H) homogenous
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Let's think first: Plasma cells are activated B cells that secrete antibodies. Plasma Cells Plasma Cells Plasma cells are the mature form of B-lymphocytes. Mature forms of B-lymphocytes secrete antibodies.... So the answer is [(G)]

How are organisms able to grow and repair their cells?
Options:
- (A) hospitalization
- (B) orchids
- (C) cell care
- (D) fungi
- (E) growth cells
- (F) mitosis
- (G) recovery
- (H) recycling
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Let's think first: Cell division is how organisms grow and repair themselves. Mitosis is cell division. Mitosis is how organisms grow and repair themselves.... So the answer is [(F)]

What is something cells cannot survive without?
Options:
- (A) gas
- (B) Air
- (C) O2
- (D) CO2
- (E) Ca
- (F) O3
- (G) Fe
- (H) He
--
Let's think first: Cells cannot survive without oxygen. And oxygen, O2, is the molecule to do it. Cells cannot survive without O2.... So the answer is [(C)]