Some bacteria live in the roots of plants like soybeans and peas what role of these bacteria in the nitrogen cycle

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Any sound above what db can cause hearing loss in human beings