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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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)]

Something more complex in eukaryotes than prokaryotes leads to what?
Options:
- (A) harm them
- (B) sweating
- (C) Growth
- (D) illness
- (E) fever
- (F) parasites
- (G) death
- (H) recycling
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Let's think first: Cell division is more complex in eukaryotes than prokaryotes. Cell division leads to the growth of cells in the population. Something that leads to growth is more complex in eukaryotes than prokaryotes.... So the answer is [(C)]

Where does intense activity occur in a plant?
Options:
- (A) Roots
- (B) Buds
- (C) bamboo
- (D) fields
- (E) Summer
- (F) years
- (G) Hairs
- (H) Petals
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Let's think first: Roots have primary and secondary meristems for growth in length and width. Meristems are zones of intense activity. Roots are zones of intense activity.... So the answer is [(A)]

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)]

What do migrants usually do?
Options:
- (A) move to different locations
- (B) animal transport
- (C) they will move to another area
- (D) spread flower seeds
- (E) dwell in a city
- (F) travel to a far away place
- (G) become their country president
- (H) dwell on a farm
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Let's think first: Migrants typically travel long distances. Distance Finder Find the distance between two places. Migrants usually travel between two places fa away from each other.... So the answer is [(F)]

Caffeine can cause
Options:
- (A) congestion
- (B) anemia
- (C) constipation
- (D) sweating
- (E) hives
- (F) energy usage
- (G) dehydration
- (H) heat energy
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Let's think first: Caffeine is a central nervous system stimulant. Stimulants can cause overheating and dehydration. Caffeine can cause dehydration.... So the answer is [(G)]