What gives the gem amethyst is purplish color?

a. Quartz

b. Iron

c. Oxygen

d. Titanium

What is one of the ways in which the skin cools the body? creating extra keratin decreasing the body's melanin sending more collagen to the cells dilating surface blood vessels

Joshua has a disease in which the walls of his small intestine have become painfully inflamed. his diagnosis is

Scientists are conducting a study on the effectiveness of a new drug on memory loss. They are giving some of the test subjects the new drug to find out if it improves their long-term memory.

What causes populations to compete?

You've done a large series of experiments, growing different combinations of crop plants together. Which of the following plots would identify species that are particularly strong in terms of interspecific competition? a.

Define adaptation as a change that improves the change of survival for a species in a specific environment

The figure shows an energy pyramid for an ecosystem. What happens to the amount of energy in the pyramid as it moves up through the different levels?

If you had a sequence that was 32% thymine, how would the percentages be formed?

Looking at a cell under a microscope, you note that it is prokaryote. How do you know?/ A) the cell lacks cytoplasm B) the cell lacks a cell membrane C) the cell lacks a nuceleus D) the cell lacks genetic material

Similarity and differences between a female and a male urethra