Which supercontinents were present on Earth at the beginning of
the Cretaceous period?
O A. Pangaea
O B. Laurasia and Gondwana
O C. Rodinia
O D. Laurussia and Gondwana

70 pts answer the following questions in full sentences and paragraphs, using at least 150 words, in the essay box below. 1. which organisms are carnivores? herbivores? omnivores? 2. if the ecosystem is balanced, which populations should be the largest? the smallest? 3. imagine a group of hunters kills half of the rabbit population. how will the other organisms be affected? 4. imagine disease kills 85 percent of the wolf population. how will the other organisms be affected? 5. imagine a foreign mountain lion species is introduced into the ecosystem. how will the other organisms be affected?

How can studying economics us make better choices about how to use scare resources

How are the arctic and antarctic circles alike?