Carbon dioxide levels in the beginning of the Industrial Revolution was about 280 ppm (parts per million). If carbon dioxide levels have increased 38%, how much carbon dioxide is now in the atmosphere? 737 ppm

386 ppm

10640

8960 ppm

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

which

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

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

wegner's theory did not explain how the continents could move

explanation:

i wish i could with all of them i can barley see the first one so here's the answer to the first one b