Both human activity and natural forces contribute to the levels of carbon dioxide in the atmosphere. which of the following contributors is caused solely by human activity?

a. volcanic eruptions
b. forest fires
c. using fossil fuels for energy
d. respiration

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

Nh3 +02-no + h20 is unbalanced what is the balanced equation

Linda and julia are trying to determine whether their ideas are scientific or pseudoscientific. linda's idea is free of bias. julia's idea gives the same result when tested repeatedly. which statement is correct about linda and julia's idea?