Ilove to use this for my bio hw so my question is a group of similar cells that perform a particular function is a- an organ b- an organ system c- a tissue d- a division of labor

I'm pretty sure the answer is B.

Hope this helps and don't forget to hit that heart :)

I believe the answer is C.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.