Viruses can only replicate themselves within cells, not outside of a cell.

True or False?

Hooray! There's no school today. This is because the rain that was left on the roads and trees last night froze. What must have occurred for this happen? A) The water particles must have lost energy B) The water particles must have gained energy.

If you were to jog for an hour, which energy storage molecules would your body access?

How do most primary producers make their own food? Select one: a. by breaking down remains to make carbon dioxide b. by changing water into carbon dioxide c. by using light energy to make carbohydrates d.

Which division of the nervous system calms the body after an emergency has passed?

What is the symbol for calcium? Cm Cl Ca C

Which effect is most likely caused by nondisjunction during meiosis? A. an extra chromosome B. an increase in nuclei C. increased survival benefits from traits D. only two types of nitrogenous bases

A segment of dna that codes for rna and a protein is a

For older adults and previously inactive individuals, exercise intensity should fall closer to what percentage of the maximal heart rate?

Colleen has been advised by her physician to avoid taking high-dose supplements of certain vitamins because they can accumulate to toxic levels in her body. which vitamins?

In 1865, a biologist, St. George Jackson Mivart, constructed an evolutionary tree of existing primate species with many branches based on analysis of spinal columns. But to his dismay, another tree based on limb comparison was quite different.