1. homer wanted to see what kitchen cleaner worked best for cleaning his counters. he
used lysol, clorox, pinesol and just water. for each cleaner he put 5 milliliters of grape
juice on the counter, sprayed the cleaner and wiped it with a paper towel.
a. independent variable (iv):
b. dependent variable (dv):
c. control:

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

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.

When energy is used, atp molecules convert to adp molecules. this process is called