Which of the following occurs in January when the earth is closest to the sun? A perihelion
An aphelion
A revolution
An ellipse

What is unique about the members of the group of fungi to which penicillium notatum belongs? they are not important for medicine. they are not made up of hyphae. they are used in fermentation. they lost the reproductive phase.

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

What must be true for natural selection to heppen