2. Which of the
following best
describes the
importance of plants
in regards to the
atmosphere?
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A. Plants give off carbon dioxide and take in oxygen.
B. Plants do not use any parts of the atmosphere.
C. Plants take in nitrogen and give off carbon dioxide.
D. Plants take in carbon dioxide and give off oxygen.

Write the correct abbreviation for each metric unit

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?