Place the following steps of muscle contraction in the order in which they occur. -Neuron stimulates a muscle cell -Ca2+ is released from the sarcoplasmic reticulum -Troponin moves tropomyosin protein -Action potential triggers opening of Ca2+ release channel

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food