An onion is made-up of layers, which is separated by a thin skin or
membrane. The cells are easily visible under a high power, compound microscope
and the preparation of a thin section is straightforward.<span> </span>
<span>The correct
procedure for preparing a stained wet mount of onion epidermis are as follows.
First, place a piece of thin onion epidermis on a slide. Second, add one drop
of water and put one edge of a coverslip in the water drop, and then slowly
lower the opposite edge to the water. Third, put one drop of stain at one edge
of the coverslip and put a piece of paper towel at the opposite side of the
coverslip. Lastly, allow the towel to absorb some water so that the stain will
move under the coverslip and view it under a microscope. </span>
<em>The birth rate (technically, births/population rate) is the total number of live births per 1,000 in a population in a year or period. lower birth rate will reduce the rate at which a population grows. ... Consider a population that increases 5% every year.</em>
Answer: C
Explanation: When four oxygen molecules bind up , the hemoglobin forms a compound called oxyhemogoblin
Answer:
Climate change lead to the destruction of corals due a warming of the oceans, increase in ocean acidity as gases such as carbon dioxide are absorbed into the oceans, rise in sea level due to melting glaciers and increase in precipitation, changes in storm patterns, etc.
Symbiosis is a close relationship between two dissimilar organisms which usually results in benefits to one or both organisms.
<em>Note: The study material was not provided.</em>
Explanation:
Greenhouse gas emissions from human activities have led to an increase in global surface temperature. This has resulted in a warming of the oceans, increase in ocean acidity as gases such as carbon dioxide are absorbed into the oceans, rise in sea level due to melting glaciers and increase in precipitation, changes in storm patterns, etc.
The warming of the oceans poses a great threat to life and activities in the ocean. Coral reefs especially are affected by a warming of the ocean in the following ways:
- mass coral bleaching- with increase in ocean temperature, corals remove the algae living in association with them that are responsible for their colour, thereby turning corals white. With prolonged bleaching periods, the corals eventually eventually die
.
- Sea level rise: with rise in sea level comes a likelihood of increase in flow of sediments into the sea. This sediments when deposited on corals found near land suffocates and kill the corals.
- Changes in storm patterns: stronger and more frequent storms can lead to a destruction of coral reefs.
- Increase in the acidity of oceans results in death of corals.
Corals and algae exist in a symbiotic (mutualistic) relationship in coral reefs. The coral provides the algae with a protected environment and compounds they need for photosynthesis. In return, the algae produce oxygen and help the coral to remove wastes.
Therefore, symbiosis is a close relationship between two dissimilar organisms which usually results in benefits to one or both organisms.
