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statuscvo [17]
3 years ago
14

What does the presence of eyes in blind cave fish indicate about the fishes ancestry?

Biology
2 answers:
AnnyKZ [126]3 years ago
4 0
It indicates that the fish had ancestors that did have eyes that were used to see, and then, because of natural selection and evolution, the fish evolved to not need eyesight, thus being blind, but, did not evolve so that there were no eye sockets etc.
Ad libitum [116K]3 years ago
3 0
It indicates that some of the fish ancestors didn't have good eyesight or none at all
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Facilitated diffusion allows certain kinds of compounds that are normally blocked by the cell
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Answer:

Potassium

Explanation:

All of the options are compounds, except for potassium which is an element

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All living things are made of ________ like carbon, nitrogen, and oxygen
MrRissso [65]

Answer:

Water

Explanation: I think this is the answer if I am wrong please tell me thank you.

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The ecology question above says : A fast swimming strong body fish such as a swimming which is adapted to clear fast and strong
Dafna11 [192]

Correct question:  A fast swimming strong body fish such as a <u>salmon</u> which is adapted to clear fast and strong water current would most likely be found in which aquatic zone? Options in the attached file

Answer:

Source of a river zone

Explanation:

The fishes body is directly correlated with their environment and the pressures they receive from it. Those animals that are used to living in clear waters, with fast currents must be very strong, must have a hydrodynamic torpedo-like body and big and strong caudal fin to propel against the currents. These animals are used to living in water masses such as the source of a river zone.

Rivers belong to lotic environments, characterized by constant moving water.

  • Profundal zone: Sunlight can not reach this zone, so there are no plants. The Water movement is very limited, and in most cases, water is not clear.
  • Littoral zone: Is the transition zone, near the shore, where the light easily reaches the bottom. Usually, there is plenty of vegetation fixated to the bottom.
  • Wetland zone: In general these are calm water, very rich in diversity, and a proper breeding area for a wide variety of fish.
  • Source of a River zone: Rivers flow from higher to lower areas. They originate at the top of the mountains and fastly descend to finally end in a lake or in the sea.

Some species of salmons characterize by living in the sea during sexual maturity, but whenever they need to breed, they go back to the area where they were born. This is in sweet water. They swim in the river until they reach the place where they are going to oviposit. In order to do this, they need to swim against the current. Many times, females die trying to reach this special place.

7 0
3 years ago
List and describe the functions of the three types of blood vessels in the circulatory system
baherus [9]
<span>There are three major types of blood vessels: the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the capillaries back toward the heart</span>
6 0
3 years ago
Which of the following is NOT true about the cohesion-tension model of water transport?Select one:a. Water must completely fill
aksik [14]

Answer:

d. Water is transported in the phloem.

Explanation:

Xylem is the vascular tissue responsible for the movement of water and dissolved minerals from roots to various plant parts. Phloem is another vascular tissue that serves mainly in the translocation of sugars. The cohesion-tension model of water transport explains that the upward movement of water from roots to the aerial plant parts is drive by transpiration pull. Transpiration of water from leaves results in a large negative pressure in xylem elements. Cohesion and adhesion properties of water maintain the water column in xylem elements.

5 0
3 years ago
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