The wood in a matchstick is made of cellulose, a polymer of glucose molecules. When you light the matchstick, heat and light are given off, indicating that an exothermic reaction is occurring.
There are two types of reactions:
1. Exothermic reactions: In these reactions, the reactants combine to form product and heat is liberated. Example, burning of fuel.
2.Endothermic reactions: In these reactions, the reactants combine to form product and heat gets absorbed from the surroundings. Example, photosynthesis in plants where the energy of the Sun gets absorbed.
Answer:
A. Migration
Explanation:
Migration is one of the evolutionary forces that change the allele frequencies of the population. Migration refers to the movement of individuals from one population to another. As the individuals move out of a population, transfer of alleles also takes place. When the immigrated individuals interbreed in a new population, they add new alleles to the gene pool of that population.
In the given example, 200 garter snakes moved out of the population resulting in changed allele frequency of the original population. Since the changed allele frequency was due to the movement of snakes, it represents migration.
Vitamin D mostly helps the body absorb calcium (which we need for strong bones) and helps keep immune systems strong. Vitamin D deficiency leads to more flu and colds, fragile bones, weak muscles, high blood pressure and depression. Deficiency can lead to hundreds of diseases.
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Answer:
Albert Einstein is a German-born physicist and scientist who has created many ideas and theories relating to the study of relative. He is famously known for creating the famous equation (Energy equals mass times the speed of light squared).
He was involved in the help of creating nuclear powered- mechanisms (not for destroying things, but for helpful, everyday things). Matter has an inherent amount of energy to it, mass can be converted (under the right conditions) to pure energy, and energy can be used to create massive objects that did not exist previously. Nuclear fission takes place when a heavy atomic nucleus, such as uranium, breaks into two or more smaller pieces with the release of some energy. During this process some of the mass of the original atom is converted into energy in accordance with the equation .