Answer:
"Iodine" is an essential mineral for the proper functioning of our body, since it is a key component of the thyroid hormones that produce the thyroid gland and also the human body cannot produce it by itself, so it is necessary that Enter through food or supplements.
Explanation:
Thyroid hormones have vital functions such as regulating energy metabolism and nutrients such as proteins, carbohydrates and fats. They also affect tissue growth, especially the nervous; They also participate in the regulation of body temperature.
That is why the adequate supply of iodine contributes to the normal functioning of the thyroid, but if it is excessive it can cause health problems such as hyperthyroidism; and if its contribution is too low, it can generate hypothyroidism or even irreversible consequences if this deficit is severe or occurs, for example, in pregnancy, lactation or first year of life.
The daily needs of iodine are actually very small, 150 micrograms per day for adults and adolescents; What happens is that it increases almost double during breastfeeding and pregnancy.
A). The algae purify the water
B). The local plants produce flowers early
C). Fish and other aquatic life die off
D). Plant and animal populations increase
2. Of the following, which is most likely to happen after a farmer sprays his crops with pesticides?
A). The crops die
B). Insect population increases
C). The soil dries up and blows away
D). A neighbor's well tests positive for pesticides
The rapid growth of algae in the river results in algal bloom and is acknowledged by the water discoloration due to their pigments. It is harmful to aquatic life and leads to fish die-offs as well as for human consumption.
A neighbor’s well might test positive for pesticide if the farmer sprays his crop with pesticides.
Further Explanation:
An algal bloom can occur in marine or freshwater ecosystems. It is caused due to the accumulation of a large number of nutrients such as nitrogen and phosphorus in the water bodies. These nutrients support the enhanced growth of green plants and algae. The color of the algal bloom is determined by the photosynthetic pigment in the algal cells and therefore, can be greenish, brown, red, or yellow in color.
The presence of an excess of nutrients results in a freshwater algal bloom. The fertilizers used in the agricultural land may result in the excess nutrients which are drained into the water bodies along with rainwater. The nutrients may also drain off from the household wastes. The high concentration of nutrients speeds up the growth of the algae in the water system. The algae live for a brief period of time and result in the accumulation of dead organic matter. This matter starts decaying and uses the oxygen dissolved in the river. The hypoxic conditions develop which leads to the death of the fishes and plants in large numbers due to unavailability of oxygen.
The algal bloom also causes odor and taste problems in water which is used for drinking. It can make the aquatic life devoid of sunlight by blocking its passage due to the over-accumulation of algae.
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Answer Details:
Grade: High School
Subject: Biology
Topic: Algal bloom
Keywords:
Algae, algal bloom, excess of nutrients, fish die-offs, marine ecosystem, freshwater ecosystem, photosynthetic pigments, fertilizers, dissolved oxygen, hypoxic condition, dead organic matter, aquatic life.
Answer:
antagonist to agonist
Explanation:
Glutamate has excitory effect on the nerve fibres in the central nervous system. It is mostly found in synaptic vesicle of nerves terminals in abundance and can be released through exocytosis. The glutamate has special transporters on the plasma membrane that allow it to be transported across neurons.
A drug increases the effect of the neurotransmitter is called an agonist. If it decreases the effect of the neurotransmitter it is called an antagonist. If the neurotransmitter is excitatory like glutamate above, nicotine presence will increase the excitatory effect, and presence of botox will decrease the excitatory effect by inhibit its diffusion across the neurone.
B) chlorophyll.
C) cytochrome a.
D) cytochrome c.
Answer:
relative and absolute dating
Explanation:
Two methods of dating fossil fuels are -
a) Relative Dating and b) Absolute Dating
a) Relative Dating - In this method, unknown age of fossil A is determined by comparing it with the known age of fossil B via correlation . Such " fossils B" are known as index fossils. These index fossils belong to a specific age group.
Some common example of index fossils are -
brachiopods,
trilobites, and
ammonites
b) Absolute Dating - In this method, the age of rock is determined through radiometric dating methods. Here, instead of dating the fossil itself, the rock or volcano layer above and below the fossil is dated for determining a rage of date.