The following is a list of the events that occur during a muscle contraction. what is the correct sequence of these events? 1. myosin cross-bridges bind to the actin. 2. the free myosin head splits atp. 3. calcium ion is released from the sarcoplasmic reticulum. 4. the myosin head pivots toward the center of the sarcomere. 5. calcium ion binds to troponin. 6. the myosin head binds an atp molecule and detaches from the actin.

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

What did hunter gathers do to alter the environment?

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat