The element hydrogen has three naturally occurring isotopes, H-1, H-2, H-3. What is the number of protons, neutrons, and electrons in H-3, or tritium?

An elementary student believes a running car is an example of a chemical reaction because smoke comes out of a car. Is the student correct or incorrect? Write an explanation that will either support or oppose the student's thinking.

If the bark of trees is light in color, what do you expect to happen to the percentages of light and dark moths

Biological membranes are present in all cells, and in eukaryotic cells they also form the endomembrane system. They act as gatekeepers that selectively move certain ions and compounds into and out of the cell or cell organelles.

To protect biodiversity worldwide, many conservationists suggest that at least 10 percent of Earth's land be set aside as protected preserves. This percent age is the minimum and should be considered in all cases.

The jackson prairie is a temperate grassland region in mississippi, spread over an area of fertile soil. what could be a reason why this grassland is disappearing rapidly?

Which country has the largest forest areas? A) United States B) Brazil C) Canada D) China E) Argentina

How do proteins play an important role in the mating of japanese beetles? a. by storing lipids for future use by the reproductive cells b. by making hormones that increase the drive to mate c.

Explain the current and predicted impacts of human activity on atmospheric carbon dioxide levels and Earth's temperature.

1. Which of the following is NOT an effect of soil erosion? 1. Decreased crop yield 2. Water pollution 3. Improved water quality 4. Reduced soil quality

Which of the following is generally true of an X-linked recessive pedigree? A. Disease is seen more often in males than females. B. A pattern of skipped generations is rare. C. Males are gene carriers. D.