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3 years ago

According to embryology, why do fish and birds have common ancestor?

Biology

1 answer:

Cloud [144]3 years ago

8 0

Answer:

Both fish and bird embryos possess gill slits and gill arches.

Explanation:

Embryology -- the study of embryos -- is a fundamental area that is correlated to evolution. Together, they have provided evidence that we all evolved from a common ancestor.

This area of study has showed that embryos that look completely different as adults share many similarities during their development. This is the case of numerous species, such as humans and birds and fish and birds.

Both fish and bird embryos possess gill slits and gill arches. However, only fish possess them as adults. Gill slits develop into gill individual openings and gill arches will eventually support these gills. In contrast, adult birds do not possess gills, they are only present during their development. This provides significant insight into the previously mentioned common ancestor theory.

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1. Living in herd is an ______adaptation?

Lapatulllka [165]

Living in herd is a structural adaptation.

There are three different kinds of adaptations: behavioural, physiological and structural.

Adaptations help animals survive and their ecosystem.

The second sentence does not sound correct but it seems correct to me (just not in grammar).

Hope it helped!

8 0

4 years ago

Read 2 more answers

The price of a book is thrice that of an exercise book. of a student spend #9600 on book and #8000 on exercise book, he has 56 i

poizon [28]

Answer:

a) price of an exercise book = #200

b) #400

Explanation:

Let x represent the price of the book

Let y represent the price of the exercise book

- According to this question, the price of the book is thrice that of an exercise book i.e. x = 3y

- Also, the question states that if a student spend #9600 on book and #8000 on exercise book, he has 56 items altogether. This means that to get how many books and exercise books he bought, we divide the price of book and exercise book he bought by the price of each book (x) and exercise book (y) respectively. Mathematically, this means:

- Student bought 9600/x books

- Student bought 8000/y exercise books

So, 9600/x books + 8000/y exercise books = 56 item

9600/x + 8000/y = 56

Since x = 3y

We can say;

9600/3y + 8000/y = 56

Find the L.C.M of 3y and y = 3y and solve using fraction method (see attachment).

9600 + 24000/3y = 56

33600/3y = 56

Cross multiply

33600 = 56 × 3y

33600 = 168y

Divide both sides by 168

33600/168 = 168y/168

200 = y

y = 200

Since, x = 3y

x = 3 × 200

x = 600

Therefore, the price of book (x) and exercise book (y) are #600 and #200 respectively.

b) The difference between the price of a book and an exercise book i.e. x - y

= #600 - #200

= #400

6 0

3 years ago

Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as th

aniked [119]

Answer:

Explanation:way

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4 years ago

Which of the following effects do the sun and moon have on tides when they are nearly in line with Earth

stira [4]

The sun and the moon has an effect on the tides when they are nearly in line with Earth during a new moon. Because of this they produce a tide with the greatest difference between consecutive low and high tides.

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3 years ago

A bond of the following elements would be of what type? Na + Cl Covalent or ionic

nikklg [1K]

Answer:

ionic

Explanation:

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.

There are one valance electron in sodium so it needed to lose one valance electrons to complete the octet while chlorine needed one electron to complete the octet. Thus electrons lost by sodium atom is gained by atom of chlorine and form ionic compound.

2Na + Cl₂ → 2NaCl

6 0

3 years ago