What is the primary cause for species extinction today?

pollution
habitat destruction
invasive species
excessive hunting

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

True or false. the baltic states have taken steps to diversify. or decrease the variety of their industries

Which of the following can scientists estimate geologic time? a. observing rock sequences b. radiometric dating c. comparing fossils d. all of these