magine a scenario in which a common population of animals is separated into two groups by a natural event. Over time, you might expect the two populations to become genetically similar. This process is known as speciation.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

trachea, alveoli, lung capillaries, arteries

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.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.