The clean water act was the law that required industries to reduce or eliminate point source pollution in surface waters. The clean water act was the federal law in the united states that was signed in 1972 governing water pollution. it was enacted to provide for the prevention and control of water pollution, and for the maintaining or restoring wholesomeness of water in the country. The growing public awareness and concern for controlling water pollution led to sweeping amendments in 1972, thus establishing basic structure for regulating pollution discharges into the waters of the united states.
Answer:
D. People allow only organisms with certain traits to reproduce.
In immunology two types of immune response are described depending on whether there is prior contact with the antigen.
• At this first contact, only lymphocytes with receptors specific to the antigen in question are stimulated and lead to the production of antibodies capable of neutralizing it. The lymphocytes capable of recognizing a specific antigen are very few and the production of antibodies - of low intensity and limited duration - is detectable only after a period of latency of several days. This is called the primary response. The specificity of the resulting seropositivity, however, makes it possible to detect contamination (seroconversion).
• Upon re-contact with an antigen that has already triggered a primary response, specific antibody production is found to increase rapidly after a short latency period. The secretion of IgG then reaches levels much higher than those observed during the primary response, while that of IgM is of the same order. This early and intense response, called secondary response, most often results in the destruction of infectious agents before any clinical sign.
• Many centuries before the discovery of microbes, it was noted that people who developed a contagious disease without death were then specifically immunized against the disease, without being protected against others.
• The ability to react appropriately to an already received stimulus supposes the existence of a memory. The immune memory is based on the existence of memory B and T lymphocytes, resulting from the clonal expansion due to the first contact with the antigen. Their lifespan is significantly higher than that of other lymphocytes and their high reactivity gives its rapid and intense character to the secondary response.
Hazardous chemicals can damage proto-oncogenes; B.
A natural calamity in which a low pressure centered low atmospheric air movement along with strong winds and rain occurs is called a hurricane it is also known as a tropical cyclone.
The effect that most likely occurs due to a hurricane is:
Option A. Damaged houses due to flooding.
The effect can be explained as:
- The hurricane can cause storm surge in which the levels of the sea rises than normal and causes high tides that can lead to floods.
- The heavy rainfalls and typhoons caused by hurricanes lead to floods that damage homes.
- Hail and forest fires due to lightning strikes are not caused by hurricanes and hence are not affected by the hurricane.
Therefore, hurricane causes flooding.
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