Match the time frame listed on the left with the characteristic listed on the right. Mesozoic era - Age of the dinosaurs
End of the mesozoic era -Most of Earth a desert
End of the paleozoic era -A layer of iridium deposited all over Earth

What type of specimens where you able to see under each of the microscopes in the microscope activity

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase