Question

QUESTION 3 Mass extinction is: a. a time during the Cambrian period (542-488 million years ago) when most of the animal phyla in existence today evolved. b. the loss of species during the Ediacaran Period. a geological period (630-542 million years ago) when the oldest definite multicellular organisms with tissues evolved. d. a geologic period (850-630 million years ago) characterized by a very cold global climate. e. an event that wipes out the majority of species within a relatively short geological time period. QUESTION 4 Cell division of a fertilized egg (zygote) to form a multicelluar embryo is called: a. all of these answers are correct D. none of these answers are correct coelom d. gastrula e cleavage

Answer 1

3. Mass extinction is basically a phenomenon where at least half of the species die or are wiped down due to any catastrophy within a short period of time.

Hence, the correct option is (e)

4. The multicellular embryo is called gastrula. The process of the proceeding of embryo into gastrula is known as gastrulation. In this process, the gastrula contains two or more germinal layers, which later develop into various organs.

Hence, the correct option is (d)

Hope it helps, Good luck

Please do press like