<span>In chemistry, </span>activation energy<span> is a term introduced in 1889 by the Swedish scientist Svante Arrhenius to describe the minimum </span>energy<span> which must be available to a chemical system with potential reactants to result in a chemical reaction. That is the definition of it, but I have no idea what examples you want me to see are called energy of activation</span>
Answer:
The nervous system
Explanation:
The nervous system comprises the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings.
<span>Pollen Grains is also known as male gametophytes of a flowering plant. They represent the male portion in the reproductive process. Pollen grains are tiny bodies which get transported through wind, insect or other natural agents, joins with the female parts of the flower through the process of fertilisation, resulting in the formation of seeds.</span>
For measuring the temperature of a classroom, the best instrument that one can use is the THERMOMETER. The correct option is D.
Thermometer is the instrument that is specifically designed for the measurement of temperature and there are different types of thermometers for measuring different types of temperature.
Note that, barometer is used for measuring atmospheric pressure, sphygmomanometer is used for measuring blood pressure and atmosphotometer does not exist.
The substances that are being used up in cellular respiration are oxygen (O2) and glucose (C6H12O6). They are the main reactants. Cellular respiration happens in the mitochondria, the power house of the cell. Hope this answers the question.