Answer:
The "Cambrian Explosion" refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on Earth.
Explanation:
Answer:
A major obstacle life would have to overcome is having only a limited amount of natural light and then the rest of the time is darkness.
Answer:
The integumentary system is similar to a cell membrane in that both structures create a protective barrier against the outside world. How is a nerve cell specialized? Neurons have specialize cell parts called dendrites and axons. Dendrites bring electrical signals to the cell body and axons take information away from the cell body.
Explanation:
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Answer: B, C
Explanation: Scientists use radiometric dating of meteorites and analyze the impact craters on planetary body surfaces to learn about the age of the solar system and its planetary bodies.
