Examine the diagram. A diagram with two bubbles and two arrows in the middle pointing opposite ways. The left bubble says, "The environment affects human behavior. Based on this diagram, which is the best explanation of why environmental problems are difficult to solve? The environmental problems are not caused by people. The environment is too complex for people to understand it. People change the environment in different ways, which causes human behavior to change. Humans are part of the environment, so they cannot have a large impact on the environment.

thymine. in rna, thymine is replace by uracil

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

i would say it is