Option A is true about blood pH.
<span>it comes and goes through the madreporite - a small valve like structure</span>
Meaning: A dark color or material obtained by heating organic matter or wood.
Chloroplasts and mitochondria are organelles found in plant cells. Chloroplasts contains the cholrophylls while the mitochondria is the powerhouse of the cell where energy is found. In this case, the two organelles not only have inner membranes but also their own DNA and ribosomes
