When clouds trap heat emitted from earth's surface, they are acting as
a. heat shield
b. magnet
c. greenhouse gas
d. satellite

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

Which star has the highest apparent magnitude?