Since the other answer got deleted, i'll just answer it for you.
a sinoatrial node is the main pacemaker that begins each heartbeat located in the junctions of superior vena cava and the right atrium. It signals from the node that spread through the atria and determines the heart rates.
Answer:
fast, intensive reproductive investment
Explanation:
Answer:
Well, one is the Food web, on the other hand, is defined as the convoluted or complicated pathway of an ecosystem consist of numerous food. Two, The flow of energy through a single straight pathway from the lower trophic level to the higher trophic level is called food chain. three, the food web It consists of many interconnected food chains. but the food chain only consists of only one straight chain. four, with the food web The stability increases due to the presence of the complex food chains. but with the food chain The instability increases due to increasing number of separate and confined food chains... five, The food web does not get disturbed by the removal of one group of organisms. but the food chain Even if the one group is Disturbed the whole chain will be affected. six, In the food web, the members of higher trophic level depend or feed upon many different types of the organism of the lower trophic level. but yet, in the food chain Usually, member of higher trophic level depends or feed upon the single type of organisms of the lower trophic level. seven, Food web contains numerous trophic level also of different populations of species. but food chains consists of only 4-6 trophic levels of different species. and last but not least eight, a food web has no type, but a food chain has two, 1.Grazing food chain and 2. Detritus food chain. ❦Hope this helps ❦
