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Two different elements have similar chemical properties when they have the same number of valence electrons in their outermost energy level. Elements in the same column of the Periodic Table have similar chemical properties.
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The theory of natural selection, formulated by Darwin, explains how organisms with better characteristics are able to survive and reproduce. According to the theory of Darwin, genetic variations occur among organisms of a species. Those organisms which have better adaptations to survive in the environment are able to survive and pass on their traits to their offsprings. The organisms not having better characteristics are not bale to survive and those traits get completely removed through the process of evolution.
For example, Darwin studies showed that The Galapagos island comprised of 13 different kinds of finches on different islands. The main difference between these finches was their beaks. The differences in the beaks occurred due to the different modes of nutrition in the finches of different islands.
How do you do this explain
An ecosystem composes of an environment and the organisms that interact with said environment. Changing temperature leads to an unstable ecosystem because of two things; failure of adaptation for the environment, or failure of adaptations for the animals.
If the environment fails to adapt to a change in temperature, plants will die, thus causing herbivores to die and the whole food web/chain to disrupt. (Im not really going in to deep detail, but plants can die from the soil failing to fertilize.)
For animals, it may also disrupt the food chain, but natural resources such as water may be needed more in the heat. If said animal doesnt have the adaptations to compete in such an event, they die. Also, especially if the environment was previously a desert, all adaptations will be useless, and other animals will start to move in. More competition. Not only that, if the ecosystems temperature decreases, for example, many animals might die from the cold and such. They do not hibernate/ have the adaptations of an animal that lives in the cold.
All in all, changing temperature can cause an unstable ecosystem because it can disrupt the food chain/web, kill plants, kill animals, cause an increase of animals, cause a decrees of natural resources (such as water) and much more.
(Sorry for grammar, I'm on mobile and not really paying attention to it. im not really double checking my spelling because im trying to give you the information, not really write it for you as that would be too much work)
Answer: High flow O2 is best. It is used with those persons who present with severe cluster headache or migraine; the triptan is contraindicated by her B.P., Ibuprofen would not be very useful with presentation of aura and bilateral nature of her headache; ergotamine is surely contraindicated given her history.
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