Answer:
Sleep.
Awaken.
Explanation:
The time and duration of circadian rhythms are regulated by the interactions of PER(period) and TIM(timeless) genes and their proteins. The TIM proteins binds with PER- proteins and the two entered the cell nucleus to set up circadian rhythms.
At midday the two genes becomes active,and their DNAs transcribed to form PER-RNA, and TIM -RNA. These RNAs accumulated in the cell nucleus over some hours.
At dusk(night) the amount of these RNAs reached highest levels.and are translated to the PER and TIM -proteins, which bonded together and moved into the cells nucleus causing sleep in the animals.
Hours to dawn,(morning) the concentration of the two proteins exceeded their limit, and signals is sent to their genes to stop transcription, thus the protein(PER and TIM) synthesis is stopped.
At almost dawn, the PER and TIM proteins disintegrates, the cycle begins again and the individual is awake.
Auto - troph
auto means self, troph means related to nutrition or feeding
autotroph
They are planets that is made up of rocks or metals
Answer:
Physical and chemical weathering often happen at the same time, but the ... Water that freezes in cracks and forms ice, salt from evaporated seawater, ... For example, the rocks on a riverbed smooth each other because they collide in the current. ... Oxidation is the reaction of oxygen with chemicals in a rock.
Explanation:
For a liquid it can be clouds
