Bottleneck effect can be a precursor to what?
Options:
- (A) massive damage
- (B) Climate change
- (C) Destroy bridges
- (D) Cambrian explosion
- (E) ground to shake
- (F) clams
- (G) soda
- (H) extinction
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Let's think first: Bottleneck effect occurs when a population suddenly gets much smaller. Population size is the predictor of extinction probability. Bottleneck effect can be a precursor to extinction.... So the answer is [(H)]

What causes cell walls to relax?
Options:
- (A) exercise
- (B) sweating
- (C) adding heat
- (D) Energy
- (E) dilation
- (F) heat or cold
- (G) heat
- (H) Dehydration
--
Let's think first: Dilation occurs when cell walls relax. When oxygen level decreases, dilatation of the blood vessels occurs. Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.... So the answer is [(E)]

Eyes can detect images and see light using what?
Options:
- (A) vibrations
- (B) sight
- (C) lenses
- (D) sound
- (E) Energy.
- (F) Energy
- (G) touch
- (H) voltage
--
Let's think first: Sight is the ability to sense light, and the eye is the organ that senses light. Eyes detect light, organized into images that fall on the retina. Eyes can detect images and see light using sight.... So the answer is [(B)]

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)]

How do ost frogs breathe as tadpoles?
Options:
- (A) gills
- (B) sucking in air
- (C) oxygen
- (D) lungs
- (E) ligt
- (F) nektar
- (G) skin
- (H) ovaries
--
Let's think first: Most amphibians breathe with gills as larvae and with lungs as adults. Frogs are the most durable of the amphibians. Most frogs breathe with gills as larvae and with lungs as adults.... So the answer is [(A)]

What kind of plants produce pollen?
Options:
- (A) white
- (B) insects
- (C) seeds
- (D) haploid
- (E) bees
- (F) swea
- (G) grass
- (H) Conifers
--
Let's think first: Pollen consists of tiny grains that are the male gametes of plants. Haploid plants produce gametes. Pollen comes from haploid plants.... So the answer is [(D)]