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.
Wind and water carry sediments and deposit them in layers usually in a lake or ocean bottom. The process that turn sediment into solid rock are compaction and cementation. The processes of compaction and cementation together are known assedimentation.
I believe these types of structures are called vestigial structures. Vestigial structures are body parts that seemingly have no purpose or function in the current form of an organism of the given species. Examples of such structures in human include; the muscles of the ear, the appendix, the tail bone, body hair, wisdom teeth among others. These structures are often homologous to structure that are functioning normally in other species and for this reason they can be considered evidence for evolution.
Answer: Option D
Explanation:
Asthma is an obstructive pulmonary disorder in which there the bronchial tubes are extra sensitive. The passage of airways becomes inflammed and produces excess of mucous.
Asthma is generally triggered by dust particles or allergens which is found in the air. It is a very common problem and if affects many people around the world.
The people suffering from asthma must avoid dusty and smoky places to avoid or reduce asthmatic attacks.
