flat board; slab; slat; monotonous; dull; flat
chaos; confusion; disorder; chaotic; confused; uncertain
I'm told; is what I heard; is how it is, apparently; is what they said
unicellular organism; monad
as expected; predictably; not surprisingly
border; boundary; turning point; watershed; area; region
(as alike as) two peas in a pod
to ask; to inquire; to blame (someone) for; to accuse of; to care about; to regard as important
retention; maintenance; preservation
natural extinction; dying a natural death; coming to a natural end
phylogenetic tree; genealogical tree; family tree; evolutionary tree; dendrogram
ramification; branching off
coexistence; living together; symbiosis; paragenesis
underground; subterranean
to wriggle; to writhe; to squirm; to scrawl
stagnation; tie-up; standstill; congestion; delay; accumulation
domination; rule; direction; management; control (e.g. over one's emotions); determining (e.g. one's fate)
single cell; simple-minded person; one-track-minded person
perhaps; likely; probably; I dare say
bacterium; bacteria; germ
to compare (something) to; to liken; to speak figuratively; to use a simile; to use a metaphor
corresponding to (in meaning, function, etc.); being equivalent to; appropriate; suitable; to be proportionate to; to be in keeping with
divergence; ramification; bifurcation; branching off
same kind (race); homogeneousness
mating; crossbreeding; cross-fertilization; cross-fertilisation
in the event that it did not (or does not) exist; without
gender; distinction of sex; sex
to rearrange (classes); to recompose; to reset; to recombine (genes)
it does not mean that ...; I don't mean that ...; it is not the case that...
trembling; getting nervous; excited; thrilled
sex; sexual intercourse; (one's) sex; gender