Answer:
Mouth: The process of food breakdown first begins in the mouth. The tooth, tongue and jaw apply this process with a mechanical activity. While teeth provide mechanical digestion of food, saliva chemically digests food.
YUtta and esophagus): The tongue pushes the food towards the esophagus. Meanwhile, the trachea is covered with a laryngeal lid. When swallowed food reaches the esophagus, the esophagus contracts peristaltic movements, allowing the food to move towards the stomach.
Stomach: The stomach is an organ that stores food, breaks it down mechanically and secretes enzymes to digest proteins. The secretion of gastric juice is provided by the gastrin hormone. The stomach is an acidic environment. This acid kills bacteria in food and converts proteins into amino acids in enzymes in the stomach. Ultimately, a mixture of partially digested nutrients called chyme is obtained. This mixture is sprayed into the small intestine. Vitamin B12 is a vitamin that is released from the stomach.
Answer:
b) In nature, only embryonic stem cells give rise to all the different types of cells in the organism.
Explanation:
Embryonic stem cells are special type of cells formed in the embryonic stage of the life cycle of a living organism. Embryonic stem cells are capable of differentiating into every other type of cells that exists in an organism. Besides the embryonic stem cells, other types of stem cells exist, one of which is the adult stem cell.
The adult stem cell is a type of stem cell found in the tissues of adult organisms as opposed to those found in the embryo. One substantial difference between the embryonic and adult stem cells is that the embryonic stem cells are the only type of stem cells capable of giving rise to all the different types of cells in an organism i.e. embryonic stem cells are capable of differentiation while adult stem cells are not.
Variable would be the most logical
ovary
These oocytes are formed during the early development of the person, it is together formed in the embryonic stage of development.
In puberty, these oocytes have now been mature thus, the individual is ready for her first menstruation, it takes time before these oocytes are fully developed but they are formed as early as the state of the genitalia, brain, body was formed.
<span>Somehow, it is like the brain, the brain is slowly developing til the near age of puberty or late childhood. </span>
<span>Eyes are also an analogy to oocytes, during infancy these organs aren't developed yet and these years the child can only see vague and blurred vision and takes almost 2 years for the child to see clearly.</span>
