Answer:
The answer is C.
Explanation:
Halogens occupy Group 17 of the Periodic Table. This group contains six different nonmetallic elements.
Answer: Evolution
Explanation:
Evolution can be defined as the change in the characteristics of the species over a period of time which basically relies on the process of the natural selection.
The characters that allows the survival of the organism is favored and is known as the survival of fittest which is a natural selection.
This is known as evolution in which the herbicide resistant plant is favored more and has developed over a period of time.
Answer:
Winds
Explanation:
Winds only act on oceans surfaces. The winds move the upper layers of ocean waters due to drag as they blow in the atmosphere. They are the reason for waves. However, the effects of winds cannot be felt in deep oceans where much of the movement is dependent on variable densities of ocean currents (due to differences in temperatures and salinity levels).
<span>CCA stands for chromated copper arsenic. CCA is a wood preservative, which is in use since 1930. copper is the protective structure and arsenic is the insecticide used. Arsenic serves no purpose in protecting the timber, but it is the binding agent of other 2 chemcals.
The best argument in terms of science would be , not to remove CCA- treated wood from the existing building structure. this wood preservative was banned due pressure from common and not scientific reason. The concern was on arsenic exposure. The exposure level of arsenic from the treated wood is far below fatal levels , than it could be seen in diet and drinking water. Hence doesn't harm children. A research also shows that after 45 years of treatment the exposure level is almost nil. Hence it is safe to have a CCA treated woods at home.</span>
