Metastases is when cancer spreads to a different body part from where it started. They commonly develop when cancer cells break away from the main tumor and enter the bloodstream or lymphatic system. Why is this harder to treat? a
The cancer cells destroy immune function in the bloodstream.
b
The cells have evolved resistance to treatments.
c
The cancer cells stop their cell division.
d
It creates new tumors throughout the body.

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.