Reproductive isolation but more specifically I think it would be geographic isolation
Answer:
Thyrocalcitonin or TCT
Explanation:
Thyrocalcitonin or TCT is a non-iodinated calcium lowering hormone. It is originating from the parafollicular cells or C cells (C for calcium).
The thyroid gland consists of follicles of cuboidal epithelial cells. These cuboidal cells have a nucleus at the base. These are principal cells responsible for the synthesis of thyroid hormones.
In between these follicular cells, other high cuboidal cells are present, known as parafollicular cells / C cells. These cells synthesise the hormone TCT. When there is high levels of calcium ions in the serum, TCT will release. This lowers the high level of calcium ions in the blood and plasma to normal level. This is done due to the deposition of calcium in the bone.
Zooflagellate is a free living protozoan with a whip like appendage. It is non-photosynthetic and feed on decaying organic matter. Euglena is a single cell flagellate eurkaryote, which has features of both plant and animal. Two organelles that are present in euglena but which are not present in zooflagellate are chloroplast and photoreceptors.
I think it will change, because over the years they have found different ways to show the atom, and different discoveries. We always have a new chance to discover something new about the atom.
