Which factors remained constant in each trial? Check all that apply.

the total number of people

the series of people who exchanged liquids with each other

the number of people who were infected at the end of the lab

the number of exchanges

the number of individuals who were initially infected

download the app called socratic on your phone

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.