Many scientists suggest that billions of years ago,

life on Earth began with

(1) simple, single-celled organisms

(2) simple, multicellular organisms

(3) complex, single-celled organisms

(4) complex, multicellular organisms

What causes a cell to grow in size 1 the cell takes in other cells 2 the genetic material of the cell duplicates 3 the cell divides into two parts 4 the cell takes in organic and inorganic materials

Which is a component of the biosphere? A. permafrost B. mountains C. bacteria D. argon

Describe how three common types of precipitation form.

What are the orders of the kinds of crust from youngest to oldest

A child had sickle-cell disease but niether parent is ill. what must be true of her parents genotype

What are some structural explanation for why animal and plant cells differ in response to changes in the extracellular space?

Which teeth are used for tearing food apart and are obvious in meat-eating animals?

If bluefish contains 0.336 ppm of mercury (that is, 0.336 oz of mercury per 1 * 10 6 oz of fish), how many ounces of mercury would a pregnant woman consume in a month if she ate the maximum recommended amount of bluefish?

Choose the best description of an allele

Which has three subtypes known as patrilineal, matrilineal, and ambilineal?