How does coal differ from pine trees as a source of energy? a. coal can be replaced easily, while pine trees are difficult to replace. b. coal is a nonrenewable resource, while pine trees are a renewable resource. c. coal is a clean source of energy, while pine trees cause environmental damage. d. coal is an expensive source of energy, while pine trees are an inexpensive source of 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

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.

What is used as a template during replication? a- mrna b- trna c- rrna d- dna