Which phrase best defines a galaxy?

High levels of oxygen are available on the upper layers and can be used as an electron acceptor. which organisms would you expect use other electron acceptors?

What is a sentence using Active Transport?

What is hepatitis c

Enviroment factors can influence natural selection because they can increase or decrease A) the number of chromosomes in an individual. B) the number of chromosomes in a population. C) the amount of genetic variation in an individual.

Females have two of which reproductive structure? Uterus Vagina Urethra Ovary

Explain griffith's experiment and the concept of transformation

During what process in the cell cycle does one cell become two cells?

All BUT one description applies to the structure of RNA. That is A) four nitrogenous bases. B) double-stranded molecule. C) contains a phosphate group. D) 5-carbon sugar called ribose.

Although a fetus is relatively protected in its mother's womb, a number of different toxins can harm the fetus. These include lead, mercury, glycol ethers, and many other substances. How do toxins usually reach the developing fetus

What is an abiotic factor of a marine ecosystem? A). Food produced B). Temperature change as you go deeper into the ocean C). Reproduction of animals