Hooper hypothesized that hiv-1 first entered humans in which decade?

every el niño cycle is different. every year.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)