Phagocytosis; or even: pinocytosis.
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When air is heated up the molecules spread out and move faster, so heat rises because it is less dense than the cooler air around it.
Answer:
Lung function tests (also called pulmonary function tests) include a variety of tests that check how well the lungs work. The most basic test is spirometry. This test measures the amount of air the lungs can hold. The test also measures how forcefully one can empty air from the lungs.
A great amount of Antarctic animals feed on them. Whales, penguins, fish, birds, etc. They eat phytoplankton.
Make sure you post the picture of the tree, so I can answer.
