Scientists were conducting a multiyear study on the effectiveness of a new drug for long-term memory loss. They gave some of the test subjects the new drug to find out if it improves their long-term memory
Which is a possible limitation of this study?
O Test subjects may want to participate in additional experiments.
O Test subjects may find that the drug is not effective.
O Test subjects may get bored and want to quit early.
O Test subjects may have full-time jobs.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?