group of genetically related organisms constituting a single step in the line of descent
generation
having more than one possible meaning
ambiguous
something that is required in advance
prerequisite
a noisy quarrel
altercation
a person who pleads for a cause or propounds an idea
proponent
a just detectable amount
trace
escape, either physically or mentally
elude
all of the same or similar kind or nature
homogeneous
cause to suffer
persecute
capable of being believed
credible
an increase in density
concentration
marked by blithe unconcern
nonchalant
without any attempt at concealment; completely obvious
blatant
emotionally hardened
callous
deviation from the normal or common order or form or rule
anomaly
any of several bodily processes by which substances go out of the body
discharge
find repugnant
abhor
politely warm and friendly
cordial
not disposed or willing to believe; unbelieving
incredulous
marked by active interest and enthusiasm
avid
having or experiencing a rapid onset and short but severe course
acute
working or spreading in a hidden and usually injurious way
insidious
so extremely old as seeming to belong to an earlier period
archaic
causing an emotional disturbance
disconcerting
(sometimes followed by 'of') having or showing knowledge or understanding or realization or perception
cognizant