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kramer
3 years ago
6

How are the west flowing rivers different from the east flowing rivers

Biology
1 answer:
Kazeer [188]3 years ago
8 0
Is this just in general or in a certain area?
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Under which of the following circumstances would natural selection not operate on an organism?
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3 years ago
2. Which characteristic do most cartilaginous fish have?
marysya [2.9K]

Answer:

Option 2: Spiracles.

Explanation:

Cartilaginous fish (also called Chrondricytes) have a skeleton of cartilage, instead of bone. There are two subclasses - Elasmobranchii and Holocephali. Sharks, rays, skates and sawfish are elasmobranchs while chimeras are holocephali.

Here’s a list of features of cartilaginous fish in comparison to bony fish:

1. Cartilage skeleton: unlike bony fish that have a skeleton made of bones (just like other terrestrial vertebrates), the skeleton of cartilaginous fish is made of cartilage.

2. Spiracles: this is a modified gill of sorts, it aids with respiration and is found slightly behind each eye. It leads directly to the mouth. Most cartilaginous fish possess this organ (exceptions are present, such as hammerhead sharks). Bony fish do not possess spiracles.

3. Ampullae of Lorenzini: absent in bony fish, these organs are electroreceptors that form a network of pores filled with a form of jelly that can transmit electrical signals. It allows the cartilaginous fish to sense electric fields in the water (such as the movements of a fish struggling), magnetic fields and temperature. Some bony fish such as sturgeon and lungfish may possess these organs, however research is still ongoing.

4. Claspers: male cartilaginous fish possess an organ known as claspers at their pelvic fin. This is used during reproduction to transfer the sperm into the female for fertilisation. As such, internal fertilisation occurs in cartilagonous fish. Bony fish do not possess this organ, and external fertilisation occurs.

There are many other characteristics that differentiate cartilaginous fish from bony fish. They're an extremely fascinating group of animals that unfortunately, is decreasing in numbers. Very little is known about many of these animals, so it is important that we do our best to conserve the sharks, rays, sawfish and chimeras before we lose them forever.

8 0
2 years ago
Do your genes affect the function of your circulatory system ?
MArishka [77]

Answer:

Sometimes, For example many cardiac disorders can be inherited, including arrhythmias, congenital heart disease, cardiomyopathy, and high blood cholesterol.

Explanation:

Hope that helps!

3 0
3 years ago
5. The mangrove is a plant that lives in ocean water. What would happen if root cells from a mangrove
Tresset [83]

Answer:

it will wither since it has been placed on a fresh water.

Explanation:

since mangrove plant grows on a salty water environment the available water from the mangrove plant will move to a highly concentrated region to a lowly concentrated region

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3 years ago
Your teacher says that your hypothesis for a experiment cannot be proven. Do you agree, or do you disagree? Explain your answer
Ilya [14]
It could be a yes or no... to me because you try something you did try an put your work in to it when it was hard work.... I agree because you always try when you do something... if it can't be proven at least you tried on it
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