Explain how the structure of the phospholipid creates a membrane. (hint: you’ll need to talk about the polar heads and the nonpolar tails.)

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

feral cats are estimated to eat tens of millions of native animals each night in australia

which

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

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements