Which of the following is true? Question 12 options:

1. Most organisms present early in Earth's prehistory were more complex than modern organisms.
2. Species on Earth today are but a fraction of all species that ever lived.
3. The number of species existing at one time has decreased throughout history.
4. Extinctions of past species have always happened gradually and on a small scale.
5. Bacteria represent a newer form of life, not present during the early prehistory of Earth.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

12000j is work done

it has to be b, about 97 percent.