Scientific investigations other lead to the formulation of new scientific questions. The observations Charles Darwin’s work after he returned home from his voyage and studying the selective breeding of pigeons prompted him to ask which question

What is it called when plants lose water though their leaves

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism