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lesantik [10]
3 years ago
12

A 3-hectare lake in the american midwest suddenly has succumbed to an algal bloom. what is the likely cause of eutrophication in

freshwater ecosystems, such as this one?
Biology
2 answers:
Yakvenalex [24]3 years ago
6 0

The correct answer is a nutrient runoff.  

Nutrient runoff is a major reason for eutrophication of surface waters, in which extra amount of nutrients, generally phosphorus or nitrogen, instigate growth of algae. Sources of nutrient pollution involve surface runoff from pastures and farm fields, emissions from combustion, and discharges from septic tanks.  


Brut [27]3 years ago
3 0

Answer:

Run off of nutrients enriched water into the lake

Explanation:

When a lake receives nutrients from the nearby agricultural land then it becomes nutritionally enriched due to increase in the concentration of nitrogen and potassium.  

Both nitrogen and potassium are essential nutrients responsible for enhancing crop and plant growth.  

Therefore, when lake water becomes enriched algal boom occurs thereby covering the top surface of lake and hence making the lake water devoid of oxygen. This entire process is collectively termed as eutrophication

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The species of which of these groups show neither wings nor antennae? Crustaceans/ Insects/ Arachnids
kondaur [170]
The answer is Arachnids.


Crustaceans, Insects, and Arachnids belong to the phylum Arthropoda.
Of mentioned characteristics, most of the Insects have both wings and antennae. Remember all butterfly, bees, beetles, etc. Crustaceans (crabs, lobsters, shrimp, etc) have antennae, but they have no wings.

Thus, the only group of the mentioned that shows <span>neither wings nor antennae is Arachnids. Arachnids include scorpions, spiders, ticks, etc. and as it is known, these groups have neither </span><span>wings nor antennae.</span>
6 0
3 years ago
Read 2 more answers
What type of weak bond is formed when the oxygen of one water
Amanda [17]

Answer:

hydrogen bond

Explanation:

The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond. This bond is very weak.

3 0
2 years ago
You are viewing a patients karyotype. You see 23 chromosomes total. There
In-s [12.5K]

Answer:

You are viewing an egg cell

6 0
3 years ago
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If a molecule of DNA has 30% Adenine how much of the other bases will be present?
anygoal [31]

Answer:

If a DNA molecule has 30% Adenine the percentage of the other bases is Thymine: 30% Cytosine: 20% Guanine: 20%.

Explanation:

When the percentage that a base has in a DNA molecule is given, the percentage of the other bases can be known using the Chargaff's base pair rule.

A DNA molecule has the information of the genome of a living being, according to a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine.

Chargaff was able to establish that in a DNA molecule the ratio of purine : pyrimidine of 1:1, so there must be the same amount of thymine as adenine and a similar amount of guanine for the cytosine, taking into account the complementarity of bases.

Taking into account the law of the base pair, if in a DNA chain there is 30% of Adenine, in the molecule there is:

  • <em>Adenine 30%. </em>
  • <em>Thymine 30%. </em>
  • <em>Cytosine 20%. </em>
  • <em>Guanine 20%. </em>
  • <em>Total ..... 100% </em>

In this case, the <u>Chargaff rule is useful to determine the percentage of nitrogenous bases that exist in a DNA molecule, knowing the percentage of a single base</u>.

7 0
3 years ago
Each cell has a structure that separates the inside of the cell from.the environment. What cell is this?
kotykmax [81]

Answer:

Either the cell wall or the cell membrane.

Explanation:

All cells have cell membranes which line the outside of the cell, and some cells have cell walls, which also line the outside of the cell. Since all cells have cell membranes I am inclined to believe that the correct answer would be cell membranes.

8 0
3 years ago
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