What generally carries something bright red?
Options:
- (A) bears
- (B) veins
- (C) arteries
- (D) mammals
- (E) nerves
- (F) fur seals
- (G) Cars
- (H) bones
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Let's think first: Arteries generally carry oxygen-rich blood. Oxygen-rich blood is bright red. Arteries generally carry something bright red.... So the answer is [(C)]

What do simple eukaryotes have?
Options:
- (A) Energy
- (B) fur and fat
- (C) Motility
- (D) bioaerosols
- (E) four limbs
- (F) pollen
- (G) glucose
- (H) Energy.
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Let's think first: Most protists have motility. Protists are the simplest of eukaryotes. The simplest eukaryotes have motility.... So the answer is [(C)]

Which has a unique water vascular system?
Options:
- (A) roots
- (B) trees
- (C) Conifers
- (D) Echinoids
- (E) fur seals
- (F) Most plants
- (G) ferns
- (H) bushes
--
Let's think first: Echinoderms have a unique water vascular system with tube feet. Another group of echinoderms are the echinoids. Echinoids have unique water vascular system was tube feet.... So the answer is [(D)]

What does population size influence on a species?
Options:
- (A) Quality of life
- (B) their migration pattern
- (C) their home
- (D) characteristics
- (E) Plant reproduction
- (F) their chance of living
- (G) their food preference
- (H) metabolic reaction
--
Let's think first: Population size influences the chances of a species surviving. Survival is to live, to live means hope. Population size influences the chances of a species living.... So the answer is [(F)]

Cells are programmed to _ only a set number of times.
Options:
- (A) migrate
- (B) expand
- (C) A computer
- (D) Most plants
- (E) allow growth
- (F) reproduce
- (G) contract
- (H) constrict
--
Let's think first: Cells are programmed to divide only a set number of times. Cells reproduce asexually, by dividing. Cells are programmed to reproduce only a set number of times.... So the answer is [(F)]

Harm to the respiratory and circulatory systems can come from
Options:
- (A) Greenhouse gases
- (B) hydrocarbons
- (C) Sulfur dioxide
- (D) nitrogen oxides
- (E) burning coal
- (F) fossil fuels
- (G) emissions
- (H) Greenhouse gasses
--
Let's think first: Air pollution harms the respiratory and circulatory systems. Nitrogen oxides cause air pollution. Nitrogen oxides harms the respiratory and circulatory systems.... So the answer is [(D)]