CONCEPTS: burst, forest, sun

GEN: the sun bursting through a bare forest during the winter

CONCEPTS: airport, employee, strand, tourist, wait

GEN: an employee of talks to stranded tourists waiting at the airport to be evacuated

CONCEPTS: cell, number, organism

GEN: chromosome numbers of various organisms each species has a characteristic number of chromosomes in each cell .

CONCEPTS: boat, lock, navigate

GEN:
man navigating boat through lock