The cells that make up a human body need oxygen at all times. during periods of exercise and activity, the amount of oxygen needed increases. to meet this increased need, the number of breaths per minute during exercise can be sharply higher than the number of breaths per minute while at rest. which term best describes the process by which cells work together to maintain the needed level of oxygen? a) homeostasis b) metabolism c) osmosis d) respiration

the sphincter muscles at the end of the digestive tract is the anus.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?