Passage 1
(n - plural) tests, usually over a limited period of time, to discover how effective or suitable something or someone is
trials
(n) a person who uses their left hand to write, etc. with
lefty
(n) a doctor who performs operations involving the brain or nerves
neurosurgeon
(n) something is made of only one cell:
unicellular
(n-singular) the simplest unit of a chemical substance, usually a group of two or more atoms
molecule
(adj) exact and accurate
precise
(v) to guess possible answers to a question when you do not have enough information to be certain
speculate
(adj) much greater than usual, especially in skill, intelligence, quality, etc.
exceptional
(n) material with particular physical characteristics
substance
(n) the state of being asleep for the winter
hibernation
(n) a small, hard ball of ice that falls from the sky like rain
hailstone
(adv) mostly or mainly
(adj) possible when the necessary conditions exist
potential
(n- phrase) the damage that happens to an object in ordinary use during a period
wear and tear
(n) a friend, especially one who you have been involved in difficult or dangerous, usually military, activities with
comrade
(v - informal) to think or believe
reckon
(n) one of the two halves of the brain
(adj) not mixed with anything else
pure
(v) to limit the movements or actions of someone, or to limit something and reduce its size or prevent it from increasing
(adj) the best or most effective possible in a particular situation
optimal
(n) too many things that arrive or happen at the same time
(adj) connected with a young human being or animal before birth
foetal
(v) to cause a person, animal, or part of the body to lose the ability to move or feel
paralyse
(n -phrase) a situation in which two opposite chemical reactions happen at the same speed
dynamic equilibrium
(adj) similar in size, amount, or quality to something else
comparable