challenge
a call to take part in a contest or competition
effort
to make an attempt
focus
the center of interest or activity
mindset
the established set of attitudes held by someone
perseverance
persistence in doing something despite difficulty
contagious
a disease spread from one person or organism to another by direct or indirect contact
mutate
undergo or cause to undergo change in the structure of a gene or genes
antibodies
a blood protein produced in response to and counteracting a specific antigen
bacteria
a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus,including some that can cause disease
public health
the health of the population as a whole
coax
to influence or gently urge
column
an upright pillar
hail
frozen rain that falls from clouds
hardship
severe suffering
heroic
having characteristics of a hero
flexible
bending without breaking
fragile
an object that is easily broken
frantic
wild or distraught with fear
frequent
done on many occasions
frontier
border separating two countries
extraordinary
very remarkable
essential
absolutely necessary
eager
wanting to something know
manufacture
on a large scale using machinery
