Answer:
The animals present body structure is due to evolution. It is seen in each part including the structure of the heart. The vertebrate heart becomes complex from a simpler form.
Invertebrates, the heart of fishes is two-chambered having one auricle and one ventricle. The deoxygenated blood gets purified in the gills. They are aquatic and no lungs for breathing. The hearts pump a mixture of oxygenated and deoxygenated blood to the body.
The amphibians and reptiles have 3 chambered heart as they lead terrestrial mode of life. The gills modified into the lungs. The left auricle receives pure blood and the right auricle receives deoxygenated blood. The blood purified in the lungs and in the ventricle, both types of blood get a mix. The ventricle pumps the mixed-blood throughout the body.
In the case of birds and mammal, the heart is 4 chambered and the oxygenated and deoxygenated blood are separated. These two are higher vertebrates. No mix of pure and impure blood, the body receives only the oxygenated blood.
This shows to construct the phylogenetic tree of vertebrates - the fishes should be in the bottom, and above it amphibians, reptiles, then, mammals and birds on the top branch of the tree. As the chambers and structure of the hearts modified one after another.
The answer is B, fossil fules
A(n) <u>gene</u> is a sequence of organic nitrogen base pairs that codes for a polypeptide or a protein.
What is polypeptide?
Peptides are made up of short chains of amino acids joined together by peptide bonds. The word "peptide" comes from the Ancient Greek word "peptós," which means "digested." Oligopeptides, which comprise dipeptides, tripeptides, and tetrapeptides, are chains of fewer than twenty amino acids.
A polypeptide is a peptide chain that is longer, continuous, and unbranched.
Therefore, along with nucleic acids, oligosaccharides, polysaccharides, and others, peptides belong to the large chemical families of biological polymers and oligomers.
A protein is a polypeptide that has more than 50 amino acids, on average. A protein is made up of one or more polypeptides that are structured in a biologically useful manner. Proteins are frequently coupled to other proteins, other macromolecules like DNA or RNA, or complex macromolecular assemblies.
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<span>If high amounts of sulfanilamide are in the presence of an enzyme whose substrate is paba, then the enzyme would stop functioning since the sulfanilamide inhibits the action of the enzyme. Hope this answers the question. Have a nice day.</span>
I am water ,I was put into a cup ,swallowed down the esophagus and since I’m not a solid I am put into the intestine immediately here my different vitamins are used and stored since I am still not a solid I pass the appendix with no problem . I am now being stored in the anus here i am let free as a torn skin of my old self .
I am steak, I am chewed by the teeth and swallowed Down the esophagus , i am being digested by the stomach acids and my vitamins are being stored and used . I am now entering the intestine here I am taken to the appendix to grind up a little bit of bone left on me and I am taken to the anus I am now free but now what I used to be .
I am corn I an chewed and swallowed down the esophagus I maned the chewing now I beating down the acid and I am unaffected by the acid i am taken to the intestines where I tank the appendix and do not get gridded I am taken to the anus where I come out exactly how I came in .
