Which of the following best describes how comparative anatomy can be used to determine the evolutionary relationship between two organisms?
a. organisms that have a great deal of physical similarity are more likely to share a common ancestor than two organisms with few physical traits in common.
b. comparing the physical traits of two organisms makes it possible to determine how long ago they shared a common ancestor.
c. studying the physical differences between two organisms will show which organism evolved from the other.
d. two species that have few physical traits in common do not share a common ancestor and most likely evolved from different species.

Two species that have few physical traits in common do not share a common ancestor and most likely evolved from different species.

Explanation: Took the test got it right

Two species that have few physical traits in common do not share a common ancestor and most likely evolved from different species.

Explanation:

The species that do not share the common physical traits in large number are likely to have evolved from different species. These species would not share the common ancestor. Absence of common physical traits between two species sets them apart from each other in terms of evolution. In general, the species with common ancestor are likely to share many physical traits with each other.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!