7. The two types of feedback systems that help organisms maintain homeostasis are: a) positive and negative
b) receptor and effector
c) static and dynamic
d) minor and major

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.