The lengths of a sample of tiger canines were measured. 68% of the lengths fell within a range between 15 mm and 45 mm. The mean was 30 mm. What is the standard deviation of this sample?

A. 5 mm

B. 15 mm

C. 7.5 mm

D. 30 mm

Which of the following reasons do scientists believe is responsable for climate change? a. nitrogen b. smog c. acid rain d. carbon dioxide

Which system is responsible for defending the body against harmful substances

The receptor sites where thc binds to produce its effect are found in large numbers in the brain area considered to be the seat of human consciousness, which is the science forum

How does the domain Eukarya differ from the other two domains? A) All organisms in the domain are heterotrophic. B) All organisms in the domain are multicellular. C) All organisms in the domain have eukaryotic cells.

Which of these sentences explains the difference between convergent evolution and adaptive radiation? A) Convergent evolution produces organisms with different adaptations but common ancestry, whereas adaptive radiation produces organisms with

Whenever you mix an acid with a base, they neutralize each other. If this is The case, Why is Alka-seltzer used to treat stomach aches?

Which of these formulas contain equal numbers of nitrogen atoms?

Which would be a consequence of the removal of predators from a population such as the trinidadian guppy population?

Activation of the anterior cingulate cortex would be expected to

Particles in a warmer substance have a. average kinetic energy than particles in the substance when it is cooler