Jezelyn needs to create a project that shows geographic isolation in action and decides to make a video. Which of the following would make the best project?
1) a video that shows penguin species that have different mating dances
2) a video that shows a large river that has penguin populations on both sides
3) a video that shows a penguin that is laying eggs
4) a video that shows penguins with different reproductive cycles living together

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is