Why is DDT so hazardous?

A:it does not decompose fast

B:it killed almost everything

C: it traveled to many continents through water

Which of the following explains why a scientist would want to identify this spider? Check all that apply. 1. to be certain that it is a spider 2. to compare it to similar spiders 3. to be able to accurately describe the ecosystem 4.

All of these environmental influences directly contribute to disease in humans except A) smog B) global warming C) radioactive elements such as radon. D) heavy metals such as lead and mercury.

What evidence must be considered when determining whether or not a trait is an adaptation? (site 1)

What type of wave requires a medium to transfer energy? A. electromagnetic B. mechanical C. light D. radio

What is DNA's most understood function?

What is the equation for photosynthesis

1. How would a problem with your heart effect cellular respiration? Describe the process.

Where are red blood cells formed?

Which row in the chart below correctly pairs a food molecule with its building block?

What are two differences between a rhizoid and a rhizome?