C.18
in middle school we are told the levels are 2,8,8 but once you reach high school, you find out the third level actaully can hokd up to 18.
Before mitosis can begin, the DNA within the parent cells must be duplicated so that each daughter cell receives the exact same genetic information. For this reason, cells produced during mitosis are identical. <span />
Answer:
Answer is C.
Explanation:
A. The vessel length is pretty much constant. The body can't length or shorten blood vessels.
B. Blood viscosity is also fairly constant because the composition of blood cannot change quickly enough to change resistance as needed.
C. This is the main way resistance is controlled. The smooth muscle surrounding blood vessels can rapidly respond to hormonal or metabolic stimuli and contract/relax to adjust diameter.
D. Again, temperature is fairly constant in the body and would not be a good way to alter resistance.
Convection currents are caused by the heat from the inner core.
Hope this helps!
Reduce the use of items like paper towels, plastic wraps, bottled water, and newspaper.
Reuse. Items like Tupperware containers, metal water bottles, and grocery bags can be reused for multiple times.
Recycle. Items like glass bottles, plastic can, and aluminium cans can be collected and being reprocessed into new containers.
