makes a short repeated sound tɪk

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lifetime, life expectancy, natural life ˈlaɪf spæn

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limit, constrain, constrict. rɪˈstrɪkt

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synthetic, man-made, unnaturally, #naturally. ɑːtɪˈfɪʃl̩i

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an animal, plant, human or any other living thing. ˈɔːɡənɪzəm

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still, standing, inactive >< moving. ˈstætɪk

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to be considered to be something ˈkɒnstɪtjuːt

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to gradually become flatter or smoother, or to make something become like this, because of rubbing or use weə daʊn

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grow older, become old, get older ˈeɪdʒɪŋ

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the science that deals with the relationship betweet heat and other forms of energy. θɜːməʊdaɪˈnæmɪks

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unstoppable, inevitable, unavoidable. ɪnˈeksərəbl ̩

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lively, active, energetic daɪˈnæmɪk

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damage, obliteration, demolition, #construction dɪˈstrʌkʃn̩

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lasting, never-ending, everlasting, eternal, #temporary ˈpɜːmənən

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steadiness, balance, stability, #imbalance ˌiːkwɪˈlɪbrɪəm

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substance, matter, objects məˈtɪərɪəl

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the smallest unit into which any substance can be divided without losing its own chemical nature. ˈmɒlɪkjuː

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unavoidable, predictable, foreseeable, #avoidable. ɪnˈevɪtəbl̩

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have, own, hold. pəˈzes

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in existence, extant, current ɪɡˈzɪstənt

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a change in the genetic structure of any animal or plant that makes it different from others of the same kind. mjuːˈteɪʃn̩

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optimum, goal, ideal, best-case scenario ˈɒptɪml̩

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alteration, adjustment, modification, change ædæpˈteɪʃn̩

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the state of living forever or being remembered forever. ɪmɔːˈtælɪti

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interrupt, bother, distract. dɪˈstɜːb

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development, progress, progression. iːvəˈluːʃn̩

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outstanding, prominent, noticeable ˈstraɪkɪŋ

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limitation, boundary, restriction. pəˈræmɪtə

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reach, achieve, get. əˈteɪn

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higher, better, greater. ˈʌpə

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aging theory. weər ənd teə ˈθɪəri

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surveillance, scrutiny, #neglect ɒbzəˈveɪʃn̩

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consisting of only one cell juːnɪˈseljələ

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enormous, massive, immense, huge, # tiny ˈmæməθ

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decide, conclude, settle on dɪˈtɜːmɪn

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suggest, recommend, offer prəˈpəʊz

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biological clock ɪnˈtɜːnl̩ ˈklɒk

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the chemical processes by which food is changed into energy in your body. məˈtæbəˌlɪzəm

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BMI=is a value derived from the mass (weight) and height of a person. ˈbɒdi ˌmæs ˈɪndeks

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turn upside down, turn over, double back. ɪnˈvɜːt

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is legally or officially acceptable >< invalid ˈvælɪd

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methodical, organized, #disorganized sɪstəˈmætɪk

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careful, cautious, sparing, #extravagant ˈfruːɡl̩

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capture, bind, manacle=to fasten someone or something to something else using a chain, especially in order to prevent them from escaping or being stolen ˈtʃeɪn ʌp

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imprisonment, confinement, #freedom kæpˈtɪvɪti

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if an animal hibernates, it sleeps for the whole winter. ˈhaɪbəneɪt

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weariness, tiredness, #energy. ˈleθədʒi

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companion, friend, buddymate. ˈkɒmreɪd

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clearly, noticeably, definitely. dɪˈstɪŋktli

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approximately, about, around, #exactly ˈrʌfli

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actively, dynamically, powerfully. enəˈdʒetɪkl̩i

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concentrated, exhaustive, thorough. ɪnˈtensɪv

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using very little of something ˈspeərɪŋ

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keep, save, preserve. rɪˈzɜːv

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relating to the heart and blood vessels. kɑːdiəʊˈvæskjələ

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lengthen, extend, make longer, drag something out #curtail prəˈlɒŋ

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sufficient, enough, #inadequate. ˈædɪkwət

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someone who is equable remains calm and happy and does not often get annoyed. ˈekwəbl̩

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significant, vital, important. ˈkrɪtɪkl̩

(a)