I am sure that the answer is D
Answer:
Gap junctions
Explanation:
Gap junctions form pores that connect adjacent cells. In this way signaling molecules, ions and other substances can pass through the pore to the adjacent cell. This type of cell junctions are important in cardiac muscle responses, in brain signaling, during childbirth, etc.
1- four single bonds, 2- two single and one double bond, 3- one single and one t<span>riple bond, 4- two double bonds.</span>
Now-a-days, there are many softwares and application, which can help to keep track of your fitness. Motion analysis is referred to a technique that helps in tracking the record of the human movement patterns.
The softwares and the applications based on the technique of motion analysis are referred as motion analysis systems. These application track the physical activity performed by a person and also guide abut what a person should do to remain healthy.