Answer:
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Explanation:
Macrophages are phagocytic cells which are involved in endocytosis. It is a process of engulfing antigen. Endocytosis occurs when a cell destroys something such as a virus or an infected cell.
The correct steps of endocytosis in chronological order as follows:
6. Cell recognizes the viral particle as foreign material.
1. Cell surface receptors bind to the viral particle.
4. Cell membrane curves around toward the cell's interior.
3. Viral particle is surrounded by the cell membrane.
2. Lysosome within the cell encloses the viral particle.
5. Lysosome's digestive enzymes destroy the viral particle.
Answer:
Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. One famous mass extinction event is the one that lead to the extinction of dinosaurs, 65 million years ago.
Explanation:
A water molecule is an example of a compound.
It is NOT a mixture because it is not a combination of 2 or more substances.
It is NOT an element because water is composed of two different elements, those being 2 atoms of hydrogen and 1 atom of oxygen.
It is NOT an atom because water is composed of 2 hydrogen atoms and 1 oxygen atom.
It IS a compound because it is composed of two different elements.
