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liubo4ka [24]
1 year ago
15

5. Fish use ___gills________ to breathe underwater. (However, many species of lobe-finned fishes that evolved during the Devonia

n period also had _____lungs_______________.) 6. In fossils, what anatomical evidence indicates that gills were present
Biology
1 answer:
marusya05 [52]1 year ago
7 0

Answer:

During the Devonian period which occurs 375 million years ago, gills are present in the fossil of tetrapods.

Explanation:

Gills present in tetrapods which able the marine animals to breathe inside water but with the passage of time the sac which is present around the gills convert into lungs and these tetrapods are able to live on the land. Examples of tetrapods are frog, lion, birds and salamander etc.

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Which curve shows the course of the reaction in the presence of an enzyme--the black curve or the red curve? Which line represen
nikklg [1K]
I found the attached image on the internet and it really helps complete this exercise.

First question:
In the presence of an enzyme, the course of the reaction is shown by the red curve. The necessary energy to make a reaction occur is less when there is an enzyme to help the reaction happen. Enzymes work as catalysts that act over substrates converting them into different molecules in a much accelerated way then it would happen without the enzyme's help, if it would happen at all.

Second question:
The activation energy is represented by line B. The activation energy is the energy needed to be available for a reaction to happen. If we compare it with line A, which represents the activation energy necessary for a reaction without an enzyme, we can see how much less energy is necessary to dispend when an enzyme is part of the reaction. Line C represents the energy resultant from the reaction.

3 0
1 year ago
A factor that promotes maximum production of atp in cellular metabolism is the presence of
Andrews [41]
The answer to this question would be: oxygen

The presence of oxygen allows the cell to do the aerobic reaction. Using in metabolism will result in a much higher number of ATP produced. 
When there is no oxygen, the cells make energy using the anaerobic reaction that gives a low number of ATP.
7 0
1 year ago
The study of beak size in Darwin's finches provides what kind of<br> evidence for evolution:
fiasKO [112]

Answer:

Adaptive radiation!

6 0
2 years ago
How do the simplest bacteria relate to the most complex animal?
SVEN [57.7K]

Answer:

Explanation:

As you probably already know, all of the cells in your body started from a single cell. That single cell then divided many, many times to turn into the 50 trillion or so cells that make up you. Almost all of the cells in your body share the same DNA as was found in that first cell

The components that make up the genetic code are common to all organisms! Same NUCLEOTIDES, same BACKBONE same BASE-PAIRS, same HYDROGEN BONDS! The instructions for making proteins (and traits) are in the sequence of nucleotides! These are the GENES that hold our similarities or differences

3 0
1 year ago
The diploid number of chromosomes in the mustard plant, Arabidopsis thaliana, is 10. Knowing this, answer the following question
Maslowich

Answer:

10 chromosomes

Explanation:

<u>Ten (10) chromosomes</u> would be found in each cell of Arabidopsis thaliana during prophase.

The prophase stage represents the first stage of the mitotic division immediately after the interphase. A diploid cell has 2n number of chromosomes and the ploidy level of a cell remains intact throughout the interphase to the prophase stage of mitosis.

<u>At the prophase, the chromosomes of a cell only condense and become visible under the microscope. Each chromosome is seen as being consisting of two sister chromatids joined together by a structure known as the centromere. </u>

<em>Hence, the number of chromosomes in the cells of Arabidopsis thaliana would remain the same even at the prophase stage of mitosis.</em>

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1 year ago
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