How does mass extinction affect species that survive?

there are no surviving species if a mass extinction occurs.

they will soon become extinct.

they combine gene pools.

they fill new roles in the changed environment.

Are substances released into the environment that in excess amounts cause damage

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.