What grammatical structure is the italicized portion of the sentence? houses should be designed to take advantage of the sun's heat.
a. adverb clause
b. infinitive phrase
c. past participle phrase
d. elliptical clause
e. adjective clause

In the sentence:

Houses should be designed to take advantage of the sun's heat. (guess underlined phrase: to take advantage of the sun's heat). It is an infinitive phrase. Infinitive phrases starts with infinitives that is, “to” added by a simple verb and can be used as nouns, adjectives or adverbs. In the case of including a main clause in the sentence, infinitive phrase separates it with comma

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laughter improves people's emotional and well-being.   kavita khajuria is a psychiatrist and he has defined laughter as " physical expression of humour and joy that has numorous protective qualities." when you feel under stress or sad because you have argued with a person you love, you need to laugh to feel strong enough to face the problems.

when you have an exam , you probably feel under stress. laughing will you release this tension. humour decreases the hormones that cause stress. k. khajuria   says that the brain releases some chemical components when we laugh. these chemical components are called neurotrophic factors and they are very important. they support the neurons in the brain and encourage the growth of new neurons. as a conclusion, you should laugh a lot before giving your exam. laughing will you with your exam and with your brain.

if you are having difficult times with friends or family members, laughing will also you face these problems. alannagh kelly is an assistant psychologist. she thinks that laughter can   make anger and anxiety vanish in the air. laughter can set a new and exciting atmosphere among people and it can make the bonds bewteen people stronger. so, if you are having a difficult time with someone you love, invite him / her to watch a comedy. you will probably make peace.

laugher will certainly protect you against stress and emotional pain. watching a comedy   may be a solution to stress or damaged bonds. " this remedy is fun , free, and best of all, no instructions needed."   alannagh kelly has said in her blog.