Which of the following is true regarding extinction?
a. if the rate of speciation in a clade is equal to or less than the rate of extinction, the clade will survive. b. the rate of extinction is steady from clade to clade as are the number of species contained within a clade. c. single events or several causes working together to produce extinction in a short period is referred to as mass extinction. d. extinction that occurs in a relatively short period of time is referred to as background extinction.

Which of the following represents a negatively charged ion? of t 7

How does friction with the atmosphere affect the speed of an artificial satellite

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a. earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c. earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.