The sum of ages of two brothers is 22 years six years ago the product of their ages was 21 years. find the age of the brother

Why would water have to have appeared on earth before life?

does a cross bridge in a sarcomere of a fast fiber produce the same amount of forces as a cross bridge in a sarcomere of a slow fiber?

A typical adult male? a. produces sperm up to about 65 years old. b. produces sperm during a monthly cycle. c. is born with all the sperm he will ever produce. d. produces several hundred million sperms each day

The use of The Ames test is designed to determine the rate of DNA replication in various bacterial species. detect the presence of a prophage in a cell. detect if a cell is infected by a virus. determine if a cell is resistant to an antibiotic.

Organizational members tend to experience metamorphosis before they experience the encounter stage of assimilation. Group of answer choices True False

Volcanoes, lightning, and the combustion of fossil fuels ALL contribute to acid precipitation. true false

Does an electric current cause a coiled wire to become an electric bell

Which is a renewable resource? A) coal B) sunshine C) gasoline D) natural gas

How are fitness and adaptation important to natural selection?

Where do the light-independent reactions of photosynthesis occur? A. Stroma B. Thylakoids C. Cell cytoplasm D. Intermembrane space