Answer:
guard cells
Explanation:
they control the opening and closing of the stomata
the answer is A. The hydrogen bonds cause water to resist a change in temperature
Darwins's theory of natural selection is an evidence of evolution by acquiring characters that make survival of an organism feasible in a typical environment.
Fossils records are used to support this theory, by figuring out the common ancestry of different species and different traits that have evolved in them with time.
Embryology is also used as an evidence which shows common origin of the organisms. Other evidences are geographic distributions and homologous structures of the living organisms.
When population don't change very much over time, the ecosystem is in equilibrium.
The answer is D because they could move slower or faster it depends on if the temperature is high or low
