On land, the carbon dioxide used today in photosynthesis to form carbon-containing organic molecules of plant tissues is mostly returned to the air because of
A) respiration in plants, animals, and organisms in the soil.
B) plate tectonics.
C) additional photosynthesis in the same plants.
D) erosion, decay, and general weathering.
A
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A. endocrine system B. lymph nodes C. appendix D. xiphoid process
An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is
A) nearest Earth. B) farthest from Earth. C) It travels at a constant speed everywhere in orbit.
More frequent heat waves are a possible outcome of climate change in Europe
Indicate whether the statement is true or false
Breakwaters stop or degrade the longshore-transport system by stopping waves from hitting the beach behind them.
Answer the following statement true (T) or false (F)