Describe two ways that plants and other living things depend on water?
Answer:
1. Water essential for living things to grow and reproduce.
2. Water essential for photosynthesis (plants making food to sustain life) which in turn helps animals who eat the plants to sustain life which in turn helps the food chain, etc.
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This famous photograph taken by the Voyager spacecraft shows
A) Earth as viewed from the outskirts of the solar system. B) a close-up of the rings of Neptune. C) the cloud of gas and dust in which our solar system was born. D) the Sun as viewed from the next-nearest star.
The following images show the four terrestrial planets in our solar system. Rank the planets from left to right based on the amount by which the greenhouse effect increases their surface temperatures, compared to what their temperatures would be without the greenhouse effect, from largest to smallest increase.
All gamma-ray bursters have the same fundamental driving mechanism, although we don't yet know whether it is a hypernova or a merger of two neutrons stars
Indicate whether the statement is true or false
An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2 ) A) 2.3 × 10-13 J/m3 B) 9.4 × 10-13 J/m3 C) 4.7 × 10-13 J/m3 D) 3.3 × 10-13 J/m3 E) 6.6 × 10-13 J/m3