The oldest fossils on Earth are more than 3 billion years old
a. True
b. False
Indicate whether the statement is true or false
True
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The colonial theory of animal origins states that animals ____
a. migrated on land from sponge colonies in the ocean b. originated in the colonial geologic period c. evolved from autotrophic green alga colonies d. evolved from a heterotrophic protist that formed colonies e. colonized land before they colonized the seas
Four of the five drugs listed below are stimulants
Select the exception. a. heroin b. caffeine c. nicotine d. cocaine e. amphetamine
The change in population size is measured in terms
of a. birth rates. b. death rates. c. the number of individuals entering the population. d. the number of individuals leaving the population. e. all of these.
Which phylum has a unique water vascular system that usually includes tube feet that can be used for movement?
a. Echinodermata b. Hemichordata c. Chordata d. Cnidaria