Any stimulus that, when removed after a response, strengthens the response is called a (n) positive reinforcer. negative reinforcer. unconditioned stimulus. conditioned stimulus.

The map below shows the range of three types of grasslands in the United States. Some grasses of the tallgrass prairie grow to 6 feet or taller.

Why do many plants have specialized cells that produce colorful flowers? A. To collect more sunlight B. To scare away predators C. To attract prey D. To attract insects

Why is the sodium-potassium pump considered an active transport? Which direction are the sodium and potassium bing pumped? How many sodiums are being pumped? How many potassiums are being pumped?

A scientist observes plant roots growing through the mountain side. This is evidence for which type of natural process? Physical weathering, Chemical Weathering, Erosion, Deposition

Most jobs moved from the home to the factory and led to

How many chromosomes do humans have?

Pairing of homologous chromosomes in prophase of meiosis I appears to be critical for proper alignment, crossing over, and subsequent separation. This pairing is facilitated by the sharing of sequence homology between homologous chromosomes.

What does "leeward" mean?

Which lipid acts as a chemical messenger? a. adipose tissue b. cholesterol c. testosterone d. beeswax

The degradation of alanine yields pyruvate and the degradation of leucine yields acetyl coa. can the degradation of each of these amino acids directly replenish the pool of tca intermediates? explain why or why not.