Answer:
B. the appearance of lichens and mosses in an area where a glacier has recently melted away
Explanation:
Ecological succession, which refers to the series of changes that occurs over time in an ecosystem, can be of two types namely: primary succession and secondary succession.
Primary succession is a succession that involves an area where no form of life has grown previously, hence, the area of land is barren e.g bare rock. Primary succession is first colonized by species called PIONEER SPECIES e.g. lichens, mosses etc.
According to this question, "the appearance of lichens and mosses (pioneer species) in an area where a glacier has recently melted away" is an example of PRIMARY SUCCESSION.
<span>#1) With reference to the role of oncogenes, explain how the normal controls over the cell cycle can be lost.
Answer: The way that cell cycle can be lost is by going through changes in the activity of cell cycle regulators. Cancer causes different types of mutations. There are two types of cell cycle regulators that can promote the development of cancer:
-Positive Regulators that can be over activated (become oncogenic).
-Negative Regulators (tumor suppressors) which can be inactivated.
I hope it helps, Regards. <span /><span>
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Answer:The anesthetic may cause a severe headache, which is treatable."
Explanation:
Spinal anesthesia is a type of anesthesia which is administered locally using a fine needle between L3 and L4 space or L4 and L5 space in order to avoid injury to the spinal cord. This procedure is usually carried out by a trained health personnel such as:
- a nurse anesthetists and
- anesthesiologists
Spinal anaesthesia can be used in different surgical procedures such as Caesarea sections and to manage pain during vaginal delivery in MULTIGRAVID CLIENTS, which are those clients who has been pregnant more than once.
Caesarean section is usually done while the patient is awake with the use of spinal anaesthesia. Therefore it's important to explain any possible side effects from the drug to the patient which includes a severe type of headache called post-spinal headache and it's treatable.
Answer:thats too hard sorry
Explanation:sorry but i get points so haha
<h3><u>Answer;</u></h3>
It occurs over many generations.
It happens at the genetic level.
<h3><u>Explanation</u>;</h3>
- <em><u>Evolution is the process that involves change in the inherited traits of a population over generations. </u></em>
- <em><u>The traits involved are the expressions of genes that are copied and passed from the parents to the offspring during reproduction process. Mutations in these genes results to new traits and thus heritable differences among organisms.</u></em>
- <em><u>Therefore, evolution will only occur when there is change in gene frequency within a population over a given period of time. Genetic differences that are heritable are passed to the next generation.</u></em>
