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maksim [4K]
2 years ago
5

Scientists discovered a new species of freshwater fish that lives in a pond with a very low O2 level. When they measured the oxy

gen extraction efficiency of the fish, it was twice as high as that of closely-related fresh water fish. Propose a hypothesis to explain how the fish achieve a high O2 extraction efficiency
Biology
1 answer:
AysviL [449]2 years ago
8 0

Answer:

In order to propose a hypothesis, there is a need to first see the function of gills in fishes. The gills of fishes comprise blood vessels that exhibit inherited tendencies of getting oxygen out of the water, which was consumed by fishes from their mouths. These gills also comprise thin walls, and when water moves over these walls of blood vessels, the oxygen from water moves into the blood, and then this oxygen-enriched blood goes to various organs.  

Thus, one of the hypotheses in the given case, can be the number of blood vessels, which are found in the gills of the mentioned freshwater fish to be higher in comparison to the blood vessels found in the normal fishes, and apart from this, the surface area of the thin walls, which are found in the gills is also more in the new species of freshwater fish.  

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boyakko [2]

Answer:

The correct option is A

Explanation:

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Thus, each of the identical sedimentary rock can be broken into three and placed individually; as in one part of the rock in 20 °C of water (control), another part of the rock in 40 °C and another in 60 °C of water.

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4 0
2 years ago
One of the structures seen in the image is essential to the survival of many bacteria. The lack of this structure makes some bac
Sergio039 [100]
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3 years ago
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A researcher investigates a recently discovered species of plant. The plant has vascular tissues and exhibits a sporophyte and a
Anna71 [15]

The plant contains vascular tissue and has an alternation of generation. But, it lacks seeds. So, the plant is a Pteridophyte.

  • Vascular tissues are absent in thallophytes and bryophytes. They are found in pteridophytes, gymnosperms and angiosperms.
  • The sporophyte and gametophyte generation is common in bryophytes and pteridophytes.
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Thus, the recently discovered species of the plant should be classified based on the presence of vascular tissues, gametophytes and sporophytes. As pteridophytes contain vascular tissues, sporophytes and gametophytes and lack seeds, the plant is a pteridophyte

Learn more about pteridophytes here:

brainly.com/question/12375814

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6 0
2 years ago
In which of the cultures was the concentration of toxins the highest?
Blizzard [7]
In American Indian so they Thad the highest concentration toxins
8 0
3 years ago
HELP WILL MARK YOU BRAINLIEST!
LenKa [72]

Answer:

18:repeat the experiment again

Explanation:

Because repeating the experiment would get rid of inaccurate data

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