Which is an indicator of poor air quality?

1 salt

2 bacteria

3 fertilizer

4 smog

The process of natural selection is based on the assumption that

6. Even though lipids and carbohydrates are made from the same elements (carbon, hydrogen, and oxygen), why is it easy to tell them apart when viewing a model of each?

The only natural race in linnaeu's system is?

Natural selection favors A. organisms that conserve energy by not reproducing. B. organisms that have the longest lives. C. organisms that survive long enough to reproduce. D. only the strongest and fastest organisms.

For an object to remain at rest, which of the following must be true?

How is a warm front different from a cold front? A. Warm fronts cause snow flurries in the winter, while cold fronts cause several days of rainy weather. B.

Which statement best describes messenger RNA? [Multiple Choice] A. It transfers polypeptides to the nucleus. B. It's chemically more complex than DNA. C. It had one Oxygen atom less than DNA. D. It's composed of a single strand of nucleotides.

An allele that masks another allele is known as

Is there penicillin in acyclovir

Noah wants to show the largest source of carbon on Earth for his school project. According to his research, in which form is most of the carbon on Earth stored?