Answer:
Sympathetic Nervous System.
Explanation:
Sympathetic nervous system is one of the parts of Autonomic nervous system and the other part is Parasympathetic nervous system.
As a whole the autonomic nervous system controls the unconscious responses of our body.
The main function of the Sympathetic nervous system is to stimulate the 3F response of the body. Here 3F refers to Fight, Flight and Freeze. Adrenal gland is stimulated by this system which secretes adrenaline. Due to the effect of adrenaline heart neat increases, blood pressure increases, pupils dilate, sweat glands are activated, peristalsis in the gut is inhibited, and kidney secretion increases.
Answer: A
Explanation: Ripple marks are sedimentary structures and indicate agitation by water (current or waves) or wind.
Answer:
Option A, Viruses contain either DNA or RNA.
Explanation:
Virus is a non-living microscopic molecule that requires a host to live in and reproduce. All the viruses have nucleic acid either in the form of DNA or RNA. DNA or RNA is genetic material that is enclosed with in a membrane known as capsid. Capsid is also made up of protein. They are extremely small, even smaller than a normal cell and only consist of package of nucleic acid and protein.
Hence, option A is correct
Answer:
Barrier island
Explanation:
Barrier islands represent a class of coastal landform composed of sand and sediments that forms parallel to the coast. These islands are constantly changing, being shaped by different factors which include water currents (ocean currents), erosion and waves. Some of the most important parameters that influence the length and width of barriers are tidal range (i.e., the height difference between high tide and low tide), wave energy (i.e., the energy restrained from oceanic waves), the amount of sediment supply and sea-level trends.
