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

Would really appreciate it, i have an idea but not completely sure

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Interactions between organisms and their environment impact the organism’s overall population. the jaguar panthera onca is the largest cat in north america. it is found in areas across the southwest, including arizona, new mexico, and texas. it is a carnivore that has powerful jaws and sharp teeth and preys on fish, turtles, tapirs, and many smaller mammals. which shows the relationship between the jaguar and turtles?