2) Trilobites are useful as index fossils, because each species existed for a ...

Why are populations that are more diverse usually more stable?

Americans spend billions of dollars on bottled water. Unlike days gone by, we are afraid to drink water that comes from the ground. Why?

What type of map shows changes in elevation on earths surface?

The laws of physics state that energy

Why is information oftenly missing from a scientific model?

Ozone hole refers to ... ? A. hole in ozone layer B. decrease in the ozone layer in troposphere C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere

Chemicals used in chemotherapy treatments to fight cancer can also harm cells in hair follicles and bone marrow. What characteristic do these cells most likely share with cancerous cells? A.) They form tumors. B.) They spread through the blood. C.

Binary fission is a process through which A. all cells divide. B. eukaryotic cells divide. C. prokaryotic cells divide. D. cellular DNA is cut in half.

Describe how this algal bloom might alter the local nitrogen cycle in that ecosystem.

What are the reactants in the equation for cellular respiration?