Answer:
the gallbladder and pancreas
Explanation:
These organs secrete or store substances that are needed for digestion in the first part of the small intestine, the duodenum, where most chemical digestion takes place.
Ans.
Gill slits or pharyngeal slits are defined as opening structures to throat, pharynx, or fish gills, by which passage of water from pharynx to exterior takes place in fishes. In primitive chordates, gill slits help in filtration of particles of food from surrounding water. In amphibians and fishes, gills are used for the gaseous exchange. In chordates that live in lands, such as mammals, gill slits found in developing embryos only.
Thus, the correct answer is 'option D). all chordates' as gill slits are present in all chordates at some stages of their development.
Answer:The dense connective tissue on a long bone is found surrounding the shaft of the bone but does not cover the ends of the bone.
Answer:
The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.
Explanation:
Answer:
According to molecular evidence, the closest living relatives of whales are, quite surprisingly, the artiodactyls, a group of hoofed mammals that includes deer, cows, sheep, pigs, giraffes, camels and hippos.
Explanation: