Under what conditions can igneous rock be transformed into metamorphic rock? A) if it is forced deep into Earth, where it melts into magma B) if it is heated and put under pressure for long periods of time C) if layers of sand accumulate over it and harden over a period of time D) if it is exposed at the surface and is weathered over a period of time

B)if it is heated and put under pressure for long periods of time

If the temperature was too hot, it would become magma instead and the cycle would start all over again.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.