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makkiz [27]
3 years ago
9

1. Why is the quadrat method useful for estimating snall populations? Explain why the same method would not be useful for counti

ng fish populations.​
Biology
1 answer:
irga5000 [103]3 years ago
7 0

Answer:

Quadrat method is used for estimating the number of individuals in an area. In this method, a large square area on the ground or water surface is marked, call it an enclave. The number of animals present in this enclave is counted. Then by assuming that the animals are less migratory and are uniformly distributed, their number for a large area is estimated by the use of unitary method of calculation. Example a 4 square feet area has 2 snails, then a 1000 square feet area will have (1000 x 2)/4, i.e, 500 snails in it. Fishes can be counted using this method only if they are confined in a small water body like a lake or a pond. Rivers are flowing so the fishes may move along its length which can give us an underestimate or an overestimate of their numbers. Sea has its depth and huge area, and fishes can be moving randomly in it. Hence this method will not work for river and sea fishes.

Explanation:

Hope this helps :D

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3 years ago
I want an essay on the benefits of plants. Serious answers only.
grandymaker [24]

Answer: I highly suggest that you reword this but here it is...

Plants are beneficial to the lives of many species on Earth. They provide us with oxygen, while also reducing the amount of carbon dioxide in the atmosphere.

Plant go through a process called "photosynthesis." This process allows them to take in carbon dioxide, water, and sunlight, and omit oxygen and glucose. Without plants, this process would only occur in microorganisms. By themselves, microorganisms do not have enough numbers and power to be able to provide enough oxygen for the rest of the species on the planet. All species that rely on oxygen would eventually perish.

Plants also prevent erosion. With their roots, plants hold down soil and stop the soil from moving. They provide structure and strength to the loose soil. If plants were not there to hold down soil, it would be entirely up to humans to provide structure in the soil.

Finally, plants are important to us because they provide us with a food source.  Humans use plants as a major source of energy. We eat plants, and mass produce them to feed ourselves. Plants are also a major food source for other animals that we rely for food. Animals that we eat get there energy from plants. If we wiped out the complete bottom part of the food chain, none of the other animals would survive.

Overall, plants are beneficial to us in many ways. They provide us with energy, stop erosion, and give us oxygen. Without plants, it would be impossible for humans to survive, and we would eventually perish.

3 0
3 years ago
Read 2 more answers
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3 years ago
Some closely related species of snails cannot mate because their shells spiral in opposite directions, making it impossible for
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Answer:

The type of evidence is<u> Mechanical incompatibility.</u>

Explanation:

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This isolation prevents species that diverge from interbreeding thus they lo longer able to mate with each other.

Here morphological difference  takes place which ultimately leads to behavioral isolation and thus no mating takes place.

Here snail can not mate because  their morphological structures are incompatible.

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I need help on this question

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