Athick and mostly flattened layer of cooled lava is called a volcanic crater.
a. true
b. false

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.