The most appropriate answer is B !! Homeostasis
it is a term to describe the need to maintain the suitable environment to make the cell survive !!
A cross-sectional view of a log shows a concentric pattern. Which part of the stem gives rise to this pattern?
B. Xylem
as it contribute for most of a tree's growth in diameter.
It is no charge so it is D
1 H2SO4 + 2 NaNO2 ---> 2 HNO2 + 1 Na2SO4