Why are organisms classified? A. biologists use a system of classification to group organisms based on their size
B. biologists use a system of classification to group organisms based on their political view
C. biologists use a system of classification to group organisms based on their birth date
D. biologists use a system of classification to group organisms based on their similarities

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

answer; i believe the correct answer to the above question is ( friction)

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?