Vein because they have valves to prevent back flow of blood.
The geosphere is considered that portion of the Earth system that includes the Earth's interior, rocks and minerals, landforms and the processes that shape the Earth's surface. The geosphere may be taken as the collective name for the
- hydrosphere (The hydrosphere is the liquid water component of the Earth. It includes the oceans, seas, lakes, ponds, rivers, and streams. The hydrosphere covers about 70% of the earth surface)
- cryosphere (The cryosphere is the frozen water part of the Earth system. The Beaufort Sea, north of Alaska. One part of the cryosphere is ice that is found in water),
- atmosphere( is a layer or a set of layers of gases surrounding a planet or other material body)
- lithosphere is the substantial, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth’s structure. It is bounded by the atmosphere above and the asthenosphere below. The lithosphere is further subdivided into tectonic plates. The lithosphere is the most rigid of Earth’s layers.
Tryptophan is specified by one single codon, which is what makes it so unique since it’s the only amnio acid that has one codon.
Answer:
Cytotoxic T cells
Explanation:
Perforin is the cytosolic protein and upon degranulation forms pores in the target cell. Perforin protein helps in the transport of water and ions.
Perforin is present in the granules of cytotoxic T cells. These cells have the ability to kill virus infected cells and cancer cells. Cytotoxic T cells bind with the class 1 MHC molecules. These cells are also known as CD8+ T cells.
Thus, the correct answer is option (A).
Competition, predation, cooperation, symbiosis
between same and different kinds of organisms, competes for avalible resources (food, light)
between different kinds of organisms, hunst and kills eachother in order to supply their energy (shelter)
between same organisms, lives together and helps eachother out (mates)
between different kinds or organisms, lives in close association wiht another kin of organism (space/territory)
all non-living things in an ecosystem are interconnected and changing even one thing impacts the whole ecosystem
