Many plants have thorns on their stems or leaves. what is the most likely explanation for the evolution of thorns?
a) thorns plants produce more food from photosynthesis.
b) thorns are an example of a mutation that arises in the genetic code of plants.
c) thorns plants to conserve resources like water and soil nutrients that may be used by other organisms.
d) thorns are an adaptation that some plants have evolved in order to discourage herbivores from eating the plant.

the endomembrane system i think

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.