Answer:
D
Explanation:
Because Speciation is the creation of a new species through the process of evolution.
Answer:
The leukocytes are the main defenses of our body.
Explanation:
From the mother cell it will be a differentiation, from the mother cell to be a mother cell hematopoietic, this will turn into a lymphatic mother cell until it will be 3 different kinds of lymphocytes, the B, T and NK.
Lymphocyte B is the responsible for the inmune system based in antibodies and antigens, due to specific proteins.
Lymphocytes T, are the ones that come from the mother cell of the bone marrow. They are the responsible for the immunity against some illness like cancer.
Lymphocytes NK (natural killer) are the responsible for killing bad cells (like cancer cells) because they "eat" them in a phagocytosis process.
Answer:
<u>Functions of epithelial tissue:</u>
- i. Epithelial tissue covers the body outside and lines the various cavities inside.
- ii. Epithelial tissue lines the hollow organs, body cavities, blood vessels and ducts.
- iii. Cells are rested on thin, doubled layered, non-cellular basement membrane.
- iv. Epithelial tissue has nerve supply of its own.
- v. Epithelial tissue is avascular (a = without, vascular = vessel), i.e. it lacks its own blood supply and hence, obtains nutrients which diffuse out of blood vessels.
- vi. Epithelial tissue has the power of division and regeneration. The old injured dead cells are sloughed off regularly and are replaced by new ones.
Layer 8 is older than layer 1
