Which statement best describes the law of conservation of energy?
o
a. the total energy in an open system can only increase.
b. energy cannot be created or destroyed.
c. energy cannot change forms.
o
o
d. the total energy in a dynamic system can only decrease.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

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

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat