I think its B.all the members of a population ate genetically very similar etc
Answer:
The second statement is correct: "The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach."
Explanation:
The virus attaching itself to the host cell is the first step for it to successfully infect the host. Viruses are smaller in size than bacteria, so the first statement is incorrect. The third statement is incorrect because viruses do not have the necessary machinery to carry out protein synthesis or to generate ATP, this precisely why they seek out a host to begin with. The fourth statement is false because the virus will either have DNA or RNA, but both at the same time.
Hope that answers the question, have a great day!
Dodder is a parasitic plant which has A. HAUSTORIAL ROOTS for support and absoption of nutrients from the host plant.
Dodder can not live alone. It grows from a seed and sprout from the ground but if it does not find a host within 10 days, it will die.
When the Dodder finds its host, it twines itself in a counter-clockwise direction around the stem of its host. The Dodder stem has bumps called "haustoria". These bumps are tightly pressed against the stem of the host plant and said bumps will eventually push their way inside the hosts' stem to pull the nutrients it needs to survive to the detriment of the host plant.
Dodder plant may be parasitic but it does not kill its own host instead it causes the growth of the host to be stunted.
Answer:
Absorption
Thousands of pores on the surface of the skin can absorb vitamins, acids, water and oxygen in order to provide moisture and nourishment to our skin.
Excretion
The skin is the body’s largest waste removal system. Toxins are released through the sweat glands and pores.
Secretion
The skin secretes sebum, a mixture of oils that keeps the skin soft and supple. The layer of sebum on the outermost layer of the skin is known as the acid mantle. When intact the acid mantle has a PH that ranges from 4.5-5.5. The acid mantle is acidic in nature to protect the skin from outside invasion.
Regulation
The skin regulates the body’s temperature by sweating; when water from sweat on the skin evaporates it gives off heat and cools the body. The body’s temperature increases or by shivering or getting goosebumps when the body is cold. The contraction of muscles releases energy that warms the body.
Sensation
The skin contains millions of nerve endings that transport stimuli. These nerve endings allow humans to detect sensation such as heat, cold, pain and pressure.
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Sources: Salon fundamentals Esthetics Textbook: The Integumentary System
