A teacher gives a student a non-toxic, odorless, white powder to identify. Generate four questions, each regarding a different property of the unknown powder, that could be safely tested and answered in the laboratory.

Which of these conditions made it beneficial for aquatic plants to move onto land? a. bright sunlight, abundant CO2, and lack of competitors b. filtered sunlight, abundant O2, and higher pathogens c. less water, abundant nitrogen, and no pathogens

What variables would you likely need to control? Check all that apply. soil water humidity nutrients plant growth temperature day length

What most directly causes hypertension? lack of blood flow to the heart. a weakening of a blood vessel wall excessive force to blood pumping injury to heart muscle

On which of the following objects, all sitting on the ground together, does Earth exert a greater gravitational pull than a baseball? Check all that apply. A. A pencil B. An inflatable beach ball C. A truck D. A bicycle E. A camel

For snail species that evolve larger shells in response to predation (which may or may not include these dogwinkles), what is likely to limit the size of the shells?

Differences between prokaryotic and eukaryotic promoters?

Why does directionality in carbohydrates matter?

How does the nervous system maintain homeostasis

Was Durer Roman Catholic or Protestant?

The gametophytes of an unknown plant are contained within the sporophyte, and the plant produces separate male and female gametophytes. Which the following is the best conclusion about the life cycle of this plant? a.