If organisms A, B, and C belong to the same class but to different orders and if organisms C, D, and E belong to the same order but to different families, which of the following pairs of organisms would be expected to show the greatest degree of structural homology?1. A and D2. B and D3. B and C4. D and E

D and E

Explanation:

As we move from a higher rank to a lower rank in the taxonomic hierarchy, the degree of similarities increases.i.e. the degree of similarities increases from kingdom to species. Species contain the individual who are most similar and can interbreed among themselves.

Since, A , B and C belong to same class while  C, D and E belong to same order, the degree of similarity between C,D and E will be more than that of the degree of similarity between A, B and C.

Again since C belongs to the class of A and B ,it will be more distant from D and E.

Thus D and E will be more similar than D and C or E and C.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

a time line cause it goes from 685 to 978