Answer:
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the basic unit of structure and organization in organisms. Cells arise from pre-existing cells.
Explanation:
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1839.
Answer:
The respiratory system as well as circulatory system (hormonal system) are involved in controlling the negative feedback of our body.
Explanation:
The respiratory system helps in controlling the negative feedback in such a way that if CO2 level increases in body the system acts in such a way so as to decrease its level in body . the system attains a normal level by increasing the blood circulation and increasing the breathing level forcing CO2 outside of our body.
in case of circulatory system, the blood has several hormones released from glands . the most common example is Insulin and Glucagon .
if a person is hypoglycemic then glucagon concentration increases and blood glucose concentration returns to normal and if a person has hyperglycemia then insulin level increases which in turn increases glucose uptake from body and body returns to normal level.
A food web refers to the graphical or pictorial representation of the food consumption interconnections among living organisms in a particular ecosystem. The food web usually have a base, a middle section and a top section. The base of the food web is made up of plants, which are called the producers. Plants are able to make their own food and others in the web depend on them for food. The middle section is made up of primary consumers, which are those organisms that feed directly on plants while the top section is made up of secondary consumers, which are those that feed on primary consumers.
Answer:
Protists are a diverse collection of organisms. While exceptions exist, they are primarily microscopic and unicellular, or made up of a single cell. The cells of protists are highly organized with a nucleus and specialized cellular machinery called organelles.
Kingdom Protista is said to be the most diverse kingdom, because each of its members are so individual from each other. If an organism does not belong any particular kingdom, it goes into kingdom Protista. ... This miscellanous grouping causes the organisms in the kingdom to be very different from each other.
Explanation:
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11. Cytoplasm
14. Cell wall
