When a low-pressure area moves into a region, the area tends to experience cloudiness and precipitation. Which city shown
on the weather map will most likely be experiencing
the cloudiest skies and the most rain over the next few days?|

"do a testcross with a homozygous recessive plant."

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.