Photosystem i requires light of minimum wavelength 700 nm while photosystem ii requires light of minimum wavelength 680 nm. this difference indicates that photosystem i requires energy to function than photosystem ii. this is because light of wavelength contains more energetic photons than light of wavelength.

answer: 2

explanation:

yes

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.