Environmental Science
The pyramid of number of a parasitic food chain in forest ecosystem is

sometimes inverted and sometimes upright
always inverted
mixture of inverted and upright
always upright

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Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Lower air temperature in Southern California
Low relative humidity of the air over the Pacific Ocean
Higher water temperature in the Gulf of Mexico
Higher air temperature in the Gulf States

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Environmental Science
Frost forms when:

The dew point is 32oF or below.
Objects on the ground cool below the dew point temperature.
All of these
Water vapor changes into ice without first becoming a liquid.

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