What is the bottom layer in the soil?
topsoil
parent rock
humus
subsoil

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

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.

What are the pros and cons of transect sampling?