Which factor would help ensure survival of one species over another? a) adaptabl

Question

Which factor would help ensure survival of one species over another? a) adaptable to environmental change b) being a food source for other animals c) having to compete for sparse resources To what does the term evolution refer? a) observed changes in the fossil record b) one or more theories that help explain observed changes c) as a general term to describe how something, such as a landscape, has changed over time d) all of these What were some of the earliest forms of life on Earth? a) land plants and insects b) corals and other bottom-dwelling sea creatures c) microscopic creatures that built mound-shaped structures called stromatolites d) sharks What types of life developed during the Paleozoic? a) corals, crinoids, and other creatures with shells b) trilobites c) fish and amphibians d) plants and insects e) all of these The first organisms on Earth included: a) trilobites b) algae c) complex multicellular organisms d) dinosaurs How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere? a) through photosynthesis by cyanobacteria b) through volcanic eruptions c) through asteroid impacts What is the ultimate source of food for animals living around deep-sea hydrothermal vents? a) sunlight and photosynthesis b) the decay of creatures that float on the ocean surface and settle to the bottom c) nuclear energy from the heated uranium-rich rocks d) bacteria that break down hydrogen sulfide Which creatures belong to the community of organisms that live at hydrothermal vents? a) giant clams b) red worm tubes c) white crabs d) All of these creatures belong to the community of organisms that live at hydrothermal vents

Explanation / Answer

1) Being adapatable to environment change would help in survival because when the environment changes, the species which were comfortable with the previous environment and are not adaptable will face problems and may eventually vanish. But the species which is adaptable would change itself in a way which is suitable to survive in the new environment. So a) is the correct answer.

2)Evolution means observed changes in the fossil record. a) is correct
3) The earliest species were microscopic creatures that built mound like structures called stromatolites. c) is correct.

4) Plant and insects. d) is correct

5) Algae b) is correct

6) Through photosynthesis by cyanobacteria. a) is correct answer

7) Bacteria that break down hydrogen sulfide d) is correct

8)red worm tubes b) is the correct answer

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