Definition. A fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals. Fibroblasts secrete fibrous proteins and ground substance, which together form the extracellular matrix that is the basis of connective tissue. fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals.
Therefore, there is very little chlorophyll in these tropical waters, keeping them clear. (As an aside, corals are symbioses where phytoplankton have evolved to survive in nutrient-poor tropical waters by living inside the bodies of the corals and obtaining nutrients directly from the waste products of the corals.
Thatâs just one of many reasons why this rule is so important. Here are several more: Clean water is vital to our health. One in three Americans get drinking water from streams that lacked clear protection from pollution without the Clean Water Rule. Finalizing the rule helps protect 117 million Americansâ health. Our economy depends on clean water.