Ahurricane destroyed all life forms on an island and washed away all the soil, leaving bare rock. in time, lichens grow in cracks in the rocks. what is occurring?
a. the habitat is not recovering at all.
b. primary succession is beginning.
c. secondary succession is beginning.

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

What percentage of light hits earth's surface directly?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.