Viruses are not considered living organisms because they lack some of the basic characteristics of life.
The cell is described as the smallest unit of life. Since viruses are <u>not alive</u>, we can infer that they <u>do not </u>contain one or more cells. <u>Viruses </u>have a <u>protective</u> <u>protein coat</u>, which can be considered a defined boundary.
Viruses are not capable of producing or using their own energy. They only activate when they come into contact with a host cell and <u>then use the host cell's energy. </u>
As per the pattern, viruses<u> </u><u>do not have</u> internal organization nor metabolic processes which would allow for growth, therefore, viruses do not grow nor do they produce waste in any form.
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Brain can process and store lot of information. Large brains means large heads, which makes childbirth more difficult and painful for human mothers.
Explanation:
A larger brain provides better performance. human brain size increases rapidly. Human brains are larger, more complex brains which enabled humans of this time period to interact with each other and with their surroundings in different ways.
The prefrontal cortex is slightly a larger part in the human brain. Humans have the largest cerebral cortex. It is a sheet of brain cells that folds itself multiple times in order to fit inside the skull. It enables us to process everything we see and hear and think.
Answer:
b plants take carbon dioxide from the air
Answer:
Water and nutrient uptake.
Explanation:
The root system of a plant functions as conducting tissue for water and mineral nutrients that are essential for metabolic activities of the plant.
<em>Extensive surface area of roots is an adaptation associated with efficient water and mineral nutrient uptake because this will increase the surface area of roots in contact with the soil.</em>
Robin can have a ddt concentration of 444ppm while the ddt concentration of soil is 10 ppm. This happens due to biological magnification.
<u>Explanation:</u>
In biological magnification the concentration of toxic substances at successive trophic levels keeps increasing. Due to biomagnification, what starts out as a small concentration grows while moving to successive trophic levels. DDT is a pesticide which is used to kill pests that affect crops.
DDT used in farms gets deposited in the soil. From the soil it can reach various trophic levels. At each trophic level its concentration keeps increasing.
Robin is a bird that is a secondary consumer and thus belongs to the higher trophic level. Thus even if the DDT concentration is as low as 10ppm in the soil its concentration will keep increasing and can become a high value like 444ppm.
