All categories

2 years ago

Why nematodes are called pseudo coelomates?

Biology

1 answer:

omeli [17]2 years ago

3 0

Answer:

Nematodes are referred to as "pseudocoelomates" since their coelom is not entirely lined with mesoderm ally cell - derived in most forms, and they are triploblastic.

<h2>What is a nematode?</h2>

Any unsegmented worm of the phylum Nematoda, having an elongated, cylindrical body; a roundworm

<h2>What are characteristics of the pseudocoelomate phylum?</h2>

-bilateral symmetry, unsegmented, triploblastic

-body cavity a pseudocoel

-size: some microscopic, others a few meters in length

-body veriform

-complete gut (2 cavities)

The structure of the body wall of pseudocoelomates explained:

-muscles are longitudinal (no circular) beneath the hypodermis

-non-living cuticle secreted by the hypodermis

-composed of many layers of collagen

-useful for protection and containing high pressure of hydrostatic skeleton

-muscles contract and push against fluid which causes movement

You might be interested in

The African Replacement Model (arguing that modern Homo sapiens first appeared in one place, and then spread out to other parts

Juliette [100K]

Answer:

A. Evolved in Africa and migrated into the rest of the world replacing all other populations.

Explanation:

The origin of human races has remained as a much debated point among the scientists studying the human evolution. Many scientists believe that different races evolved independently from Homo erectus and they adapted in into different places like Orientals in Asia, Caucasians in Europe, Aborigines in Australia and so on. But it is highly unlikely to believe that same species evolved more than once in different places.

Other scientists believe that human races appeared after Homo sapiens evolved from Homo erectus. The mitochondrial DNA study from human beings all over the world clearly shows that all human races originated from one Homo sapiens ancestor in Africa. Since the mitochondrial DNA is transmitted only by the females, scientists looked at it to study evolution. So far it has been observed that greatest number of different mitochondrial DNA sequences occur among the Africans and since the DNA accumulates mutations over time, the oldest DNA should show the largest number of mutations. These finding suggest that humans have been living in Africa longer than on any other continent. This supports the African replacement model which argues that H. sapiens evolved in Africa and human races evolved after that.

8 0

4 years ago

What are the differences between the 3 domains

mariarad [96]

Answer:

what are the domains? If you comment the three domains I will help <3

6 0

3 years ago

Which is the phase of meiosis in which spindle fibers form.

AysviL [449]

Answer:

Explanation:

3 0

3 years ago

Read 2 more answers

What can the scientists most likely expect to find in the layers of rock that are about the same age as the impact?

Rudiy27

The correct answer to this open question is the following.

Although you forgot to include the context of the question and the options to answer it, we can comment based on our knowledge of this topic.

What scientists most likely can expect to find in the layers of rock that are about the same age as the impact is evidence of a gradual change of one species over time.

This question has to have the following context. Scientists found evidence of a large meteor impact on the coast of the Yucatán Peninsula in Mexico.

Scientists, researchers, and geologists use special methods to date rocks and fossils on planet Earth. In this case, they have used a method called radiometric dating. These methods are based on radiation. Yes, they use the natural radioactive decay of potassium, carbon, and other elements to get to the most exact date on when things happened. In this case, the time of the meteor impact on the Yucatán Peninsula in southern México.

5 0

3 years ago

What transformation takes place wen u light up a match

Mashcka [7]

Answer:

This is a transformation from mechanical energy to thermal

Explanation:

which is (heat) energy

4 0

3 years ago

Read 2 more answers