Answer:
Replace the concentration descriptions with actual values.
Explanation:
A graph is used to convey real, accurate and objective information. The use of the description of the concentrations in place of the real values, does not represent an accurate information, but a subjective and imprecise information. For this reason, to improve the quality of this graph and allow the readers to fully understand it, it would be necessary to replace the descriptions of concentration with real values.
<span>False. When a new housing development goes up,
the original ecosystem will take years to repair itself. This is why
modernization is such a huge threat to the overall environment. A lot of
ecosystems are destroyed to build these homes and as a result, many organisms
within the thriving environment are displaced and destroyed. This is the reason
why a lot housing development programs are now gearing towards a more
sustainable form of construction. </span>
The two ultimate sources of energy for all living things on earth is sun light and certain rich compounds like chemotropes.
Answer: B. Pathways by which matter is transferred between organisms and the environment
Explanation:
Biogeochemical cycles can be define as cycles which involves the natural pathways by which inorganic and organic matter is transferred within the living organisms and the environment.
The essential elements such as water, carbon, phosphorous, nitrogen and oxygen are transferred among the various spheres of the earth like atmosphere, biosphere, lithosphere and others which forms the integral part of the non-physical environment.
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.
