Use the drop-down menus to answer the questions. Which fossil is the oldest? ammonite, crinoid, trilobite

The factors that control which traits an organism will express are called what

What is the main way heat is transferred in the troposphere? A. radiation currents B. reflection currents C. conduction currents D. convection currents

Which of the following is NOT a potential health effect of radiation? a. Thyroid disorders and cancers b. Brain damage to the unborn c. Genetic disorders d. Pneumonia

Homogeneous mixtures can only be chemically separated into their individual components. True False

Which is one of the bases found in DNA?

What type of learning describes when animals learn by watching or listening to others of their species?

The process of grouping things based on their similarities is?

Why do you think more blood goes to some organs and not others?

Which of the following would most likely employ a forester? A. a state governments B. lumber businesses C. national govemments D. all of the above

How do environmental scientists use technology to track polar bears?