<h2>
Nucleus - control center</h2>
The nucleus is called the control center of the cell because:
- The genetic material which is the essence of life is hosted in the nucleus – the DNA-which presents the code of life or information or instructions regarding:
- The structure and function of each cell and the organ it is present,
- Numerous activities of life like reproduction, metabolism, growth, development, etc.
- The nucleus replicates the genetic information and passes to the new daughter cells, generation after generation to continue the life processes.
- The nucleus DNA transcribes the code or information for protein synthesis to the RNA to synthesize proteins in the body which carry out many essential functions in the form of structural proteins, antibodies, hormones, pigments, etc.
- The nucleus DNA synthesizes enzymes which carry out functions like metabolism.
The examples of positive feedback loops are as follows:
- contractions during the process of giving birth
- Blood clotting
<h3>WHAT IS POSITIVE FEEDBACK LOOP:</h3>
- Positive feedback loop is that in which a change in a given direction causes additional change in that same direction.
- The contractions during the process of giving birth is an example of positive feedback loop because the contractions further stretch the walls and continues until birthing occurs.
- Also, the clotting of blood causes the stoppage of blood flow.
Therefore, the examples of positive feedback loops are as follows:
- contractions during the process of giving birth
- Blood clotting
Learn more about positive feedback loops at: brainly.com/question/11312580
Answer:
Endocrine glands and their hormones
The major glands of the endocrine system are the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, and the reproductive organs (ovaries and testes). The pancreas is also a part of this system; it has a role in hormone production as well as in digestion.
Explanation:
comment how it helps
2019 years have humans been on earth
Answer:
Heat, pressure and chemistry compounds around the rocks.
Explanation:
Metamorphic rock is formed by pre-existent rocks (igneous and sedimentary, sometimes from another metamorphic rock), those rocks were modified by the effect of heat (high temperature), pressure (under the terrestrial surface) and chemistry compounds around the rocks. The physical and mineralogical composition becomes different than the original form.
This process is called metamorphism.
