Why do some organisms have vestigial organs? What will be an ideal response?


Vestigial organs are the remains of structures that were once functional in an ancestor, but
offer no or reduced function now. Over time, natural selection has favored the reduction in
size of these structures which serve little or no useful purpose.

Environmental & Atmospheric Sciences

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African river blindness is caused by a roundworm carried by biting black flies. When bitten by a fly, larval worms are passed through the wound. Inside a human body, the parasites cause skin problems and eventually blindness. Which type of species interaction is represented here?

A. parasitism B. predator-prey C. commensalism D. resource partitioning

Environmental & Atmospheric Sciences

List the two techniques that are most commonly used to mine coal: ___________ and

_________. Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

Part of the cause of the greenhouse effect is the near ________ of the atmosphere to solar radiation

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Glaciers have existed throughout all of Earth's history

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences