Cross-contamination is likely to occur in which of the following situations?
a. george cleans and sanitizes his cutting board and knife after slicing raw meat and
before chopping vegetables
b. rachel pauses while preparing salads to adjust her hair under her hairnet, and then
immediately returns to her task
c. isaac uses an ice scoop to fill several glasses with ice, then places the scoop back in its
holder
d. nora washes her hands and puts on a new pair of single-use gloves before making
sandwiches

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

the correct answer is 2 and 4