B. The nervous system collects and responds to information about the external and internal environment.
Answer:
Control: sat in silence
Experiment: with music
Independent: The music or no music
Dependant: Their heart rate and pulse
Explanation: Control group: is the one that sat in silence
The one that listened to music is the Experimental Group
The independent variable is the thing that they change, the music
And the dependant variable is what is being measured, their pulse and heart rate
The smaller animals with short horns will be selected because the selection pressure, the hunters, favors their survival.
