If fitness programs are the most popular services used by employees this means they are widely used — increasing the chance of the stated benefits (productivity gains etc) being realized.
'Despite' and 'Although' both express contrast. The sentence means chromosomes are the same but size/shape/function differ — option D.
'Infringe' = to violate a law or boundary. 'Transgress' = to go beyond a limit or law. Best synonym.
'Brochure' = a small booklet with information about a product/place. 'Pamphlet' = a small booklet. Near synonyms.
'Equivocal' = ambiguous/unclear. Opposite is 'Clear' = unambiguous.
'Illusive' = deceptive/unreal. Opposite is 'Not deceptive'.
Carpenter cuts with a saw. Seamstress cuts with scissors. Both are worker:cutting-tool relationships.
Fire leaves ashes behind. An event leaves memories behind. Same cause-and-residue relationship.
Stare (intense prolonged look) vs Glance (quick brief look). Similarly Gulp (swallow large amount) vs Sip (take a small amount).
'Although' signals contrast between past certainty and present doubt. Facts once 'established' are now 'in question'.
We were surprised and pleased = the greeting was friendly (affably). Her reputation was the opposite — querulousness (irritable/complaining nature).
A metaphorical statement implies a comparison without stating it explicitly — exactly the definition of a metaphor.
First Conditional/scientific fact: if + present simple → will + base verb. 'Will' is correct.
'Mathematics' is the noun used as an adjective to modify 'teachers'. 'Mathematics teachers' is correct compound noun.
'As high as' = up to a maximum of. Standard phrase for expressing maximum value.
'Had better' + base form verb (no 'to'). 'Had better get' is correct.
Adjective + 'enough' is the correct order. 'Old enough' — not 'enough old'.
'Fail in doing something' — preposition 'in' + gerund is the correct construction.
The entire passage is about salt — its historical importance trade value and linguistic legacy.
The passage states: 'Roman soldiers transported salt crystals from the salt flats at Ostia.'