Explanation:
Positive;
Fracking is a cheap and efficient method of extracting natural gas and oil from the deep crust. Therefore this makes petroleum products cheaper and therefore is good for a petroleum energy-dependent economy since the prices of goods and services will be affordable.
Negative;
However, fracking has been shown to have negative environmental impact. There are concerns that the process causes contamination of groundwater which therefore makes it unsafe to utilize by humans and also for the ecosystems.
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The type of immunity that provides lifetime immunity for the body against a specific pathogen is called acquired immunity. It is also referred to as adaptive or specific immunity.
Acquired immunity is not present at birth. it is learned. As a person's immune system encounters foreign substances (antigens) the components of acquired immunity learn the best way to attack each antigen and begin to develop a memory for that antigen. Acquired immunity is also called specific immunity because it tailors its attack to a specific antigen previously encountered. Its uniqueness lies in its ability to learn, adapt and remember.
Acquired immunity takes time to develop after first exposure to a new antigen. However afterward, the antigen is remembered, and subsequent responses to that antigen are quicker and more effective than those that occurred after first exposure. Memory of a particular antigen is kept by the B and T lymphocytes.
Answer:
abrasion because it is not a chemical weathering like the other two
Explanation:
Clonal selection identifies a __ lymphocyte that needs to be cloned for production of a specific antibody.
is B.
