Answer:
Early organisms in the precambrian era converted ___Carbon dioxide__ to oxygen.
Explanation:
THE PRECAMBRIAN ERA:
The word Precambrian means before the Cambrian period. Before the formation of oldest rock with having fossils in them this term was used to the whole period of earth's history.
This era gone through number of important changes. One important change is that atmosphere of this era is deprived of Oxygen. All other content of the atmosphere is same as component of air present today but with little water vapours. Early organisms in the precambrian era converts carbon dioxide into oxygen. This oxygen was very less and begins to combine chemically with iron and other elements. This produces great mineral deposits around the world. This is the era from where aerobic respiration organisms start their life cycles.
b. smooth
c. cardiac
d. both
b. and
c.
In the digestive tract, mouth is the primary location where enzymes act to break the bonds between disaccharides into monosaccharides.
It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.
The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.
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Answer:
Mouth.
Explanation:
Mouth contain saliva.Saliva have enzyme salivary amylase (ptyline) which breakdown disaccharides(starch) into Monoscchrides .About 30% disaccharides(starch ) digeation occur in mouth.