A scientist wants to conduct an experiment to see if plants will grow to different heights based on the type of fertilizer used. If the scientist tests several different fertilizers on the same type of plant, the fertilizer would represent which of the following?

a. a dependent variable
b. an independent variable
c. a control
d. a placebo


b. an independent variable

Biology & Microbiology

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Playing catch with your young son, you blithely mention, “Wow, you must have excellent Ruffini endings.” He replies, “No, Mommy! My Ruffinis are beginnings!” Both of you laugh, but you explain that Ruffini endings are very helpful to humans catching balls. How do they help?

a. They detect impact stress, like when a ball hits a hand or glove. b. They detect pain when a ball hits the hand hard enough to hurt. c. They detect skin stretch and deformation in joints, allowing for object gripping. d. They detect deep pressure such as one feels when gripping a ball hard preparing to throw.

Biology & Microbiology

Early successional species are referred to as ________ species

Fill in the blank(s) with correct word

Biology & Microbiology

The American kangaroo rat is characteristic of the desert biome. Indicate whether the statement is true or false

Biology & Microbiology

What tissue in vascular plants would be used to move sugars from the roots to the stems and leaves?

a. phloem b. sclerenchyma c. xylem d. parenchyma

Biology & Microbiology