What is it called when the number of people suddenly gets smaller?
Options:
- (A) competing for resources
- (B) competition
- (C) A Greek letter
- (D) heat or cold
- (E) Earth orbiting the Sun
- (F) permineralization
- (G) bottleneck effect
- (H) relocation
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Let's think first: Bottleneck effect occurs when a population suddenly gets much smaller. Population is the number of people. Bottleneck effect occurs when the number of people suddenly gets much smaller.... So the answer is [(G)]


Fertilization occurs when an egg and what join together to form a diploid zygote?
Options:
- (A) rapid expansion
- (B) testosterone
- (C) gastropod shells
- (D) penis
- (E) peachleaf willow
- (F) pollen
- (G) male hormone
- (H) male gamete
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Let's think first: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Male gametes are called sperm. Fertilization occurs when a male gamete and an egg fuse to form a diploid zygote.... So the answer is [(H)]


What can be part of invading a host?
Options:
- (A) It helps them survive
- (B) Something that causes allergies
- (C) Movement of an air mass
- (D) energy of moving objects
- (E) vascular conncectivity
- (F) harmful substances
- (G) Leptospirosis
- (H) competing for resources
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Let's think first: Fungi have special structures for penetrating a host. Host tissue penetration occurs to the point of vascular connectivity. Fungi can invade a host to the point of vascular conncectivity.... So the answer is [(E)]


What use energy and minerals to make food?
Options:
- (A) trees
- (B) plant life
- (C) humans
- (D) producers
- (E) bears
- (F) elephants
- (G) Most plants
- (H) ferns
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Let's think first: Producers use energy and inorganic molecules to make food. Minerals are inorganic substances. Producers use energy and minerals to make food.... So the answer is [(D)]


What kind of animals has a water vascular system with tubed feet?
Options:
- (A) animals
- (B) starfish
- (C) reeds
- (D) insects
- (E) warm-blooded
- (F) sponges
- (G) sea coral
- (H) four limbs
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Let's think first: Echinoderms have a unique water vascular system with tube feet. Echinoderms are represented by the starfish. Starfish have a unique water vascular system with tube feet.... So the answer is [(B)]


What increases the productivity and stability of the entire global system?
Options:
- (A) important habitats
- (B) Plants growth
- (C) solar system
- (D) animals
- (E) biodiversity
- (F) environment
- (G) bottlenecks
- (H) power stations
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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: Biodiversity increases the productivity and stability of ecosystems. Marine ecosystems also act as stabilizers of global systems especially our climate. Biodiversity increases the productivity and stability of the entire global system.... So the answer is [(E)]