With the concerns about global warming increasing, the production of gases and their effects on the atmosphere are being closely watched. when fossil fuel is burned in a car engine, increases in the atmosphere. a) oxygen b) hydrogen c) nitrogen d) carbon dioxide

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables