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Harrizon [31]
3 years ago
13

1. Which of the following correctly compares the changes that take place in an ecosystem during primary succession and secondary

succession? (2 points)
a) Primary succession takes place over a long period of time on newly formed land, while secondary succession occurs quickly in areas that have disrupted by a natural disaster.
b) Primary succession takes place quickly on newly formed land, while secondary succession occurs over a long period of time in an area that has been disrupted by a natural disaster.
c) Primary succession takes place over a long period of time in an area that has been disrupted by a natural disaster, while secondary succession occurs quickly on newly formed land.
d) Primary succession takes place quickly in an area that has been disrupted by a natural disaster, while secondary succession occurs over a long period of time on newly formed land.

2. Which of the following is an example of how a biotic factor can affect the population dynamics in an ecosystem? (2 points)


a)Lack of water during a drought causes many of the individuals in a population to die.
b) Seasonal temperature changes cause a species to migrate between two ecosystems.
c) Excessive rain and flooding cause organisms in an area to relocate.
d) The population of a predator increases following an increase in the population of its prey.
Biology
1 answer:
mr Goodwill [35]3 years ago
6 0
The correct answers are as follows:
1. A.
There are basically two types of succession, they are primary and secondary succession. Primary succession refers to the type of succession that occurs in new and bare areas where the soil present is unable  to sustain the growth of plants. An example of primary succession area is an area with sand dunes that is freshly formed. Primary succession usually occur over a long period of time. Secondary succession is a type of succession that occur on a land which was disturbed by  hazardous events such as fire outbreak, flood, etc. Secondary succession occurs much faster than the primary succession.

2. D
There are two types of factors that affect any particular ecosystem, these are abiotic and biotic factors. The abiotic factors refers to non living factors such as temperature, relative humidity, rainfall, etc. while the biotic factors refer to the living factors. Looking at the options given above, one will see that only option D has living factor, which is predators. All other options have abiotic factors.
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mr_godi [17]

All carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates. Glucose, for instance, is a single-unit carb with six carbon atoms, 12 hydrogen atoms and six oxygen atoms

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6 0
3 years ago
Suppose that in​ 2008, 819,450 citizens died of a certain disease. Assuming the population of the country is 250 ​million, what
Goshia [24]

Answer:

The correct answer is 327.78.

Explanation:

A mortality rate refers to the determination of the rate of the occurrences of deaths in a given population in the course of a particular time period. The formula for finding the mortality rate is:  

Deaths taking place in a given time duration / the size of the populace among which the deaths have taken place × 10ⁿ

The given population of the country is 250 million

The number of individuals died due to a certain disease is 819450

Thus, the mortality rate per 100000 can be calculated as:  

819450 / 250000000 × 100000 = 327.78 deaths per 100,000 people.  

8 0
3 years ago
Evidence supporting E.coli DNA polymerase III having the major role in nucleotide incorporation during replication includes: Evi
kherson [118]

Answer:

All of the above

Explanation:

The DNA polymerase III is a multi-subunit enzyme which is essential for the synthesis and activation of the majority of the genome in Escherichia coli.

DNA replication is random in both prokaryotes and eukaryotes, causing several DNA polymerase to synergistically replicate the continuity (leading) and discrete (lagging) DNA strands.

The points that are given support and reflect the assertions that E.coli DNA polymerase III plays a very important role in nucleotide incorporation during replication.

4 0
2 years ago
Which organic molecule has been made to form in water in the laboratory ?
kogti [31]

Answer: Amino acids.

Explanation:

There were an famous experiment made by two biochemists called Stanley Miller and Harold Urey, in the year of 1953. They made it at the University of Chicago, USA.

In this experiment, Stanley Miller and Harold Urey simulated hypothetical conditions that Earth’s early atmosphere had, in order to test the hypothesis that gases (as the methane, carbon dioxide, ammonia, amonia and water vapor) allowed inorganic chemicals to form organic molecules.

 After one week, these scientis found that organic compounds were formed.

Through this experiment the scientists Stanley Miller and Harold Urey obtained that several amino acids were formed (the most abundant was Glycine).

According to their work, they got 13 of the 22 aminoacids that are used to make proteins in living cells.

6 0
2 years ago
According to the biomolecular data, we COULD infer that
mr Goodwill [35]
B) humans are more closely related to chimps
8 0
3 years ago
Read 2 more answers
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