A boy walks at a speed of 4 kmph. how much time does he take to walk a distance of 20 km?

Which challenges do countries face in limiting the spread of communicable diseases? check all that apply. 1. lack of vaccinations 2. lack of healthy food available 3. increase of worldwide travel 4. decrease of available clean water 5. increase in migration of infected animals

When studying heredity, what is the relationship of dna based and traits? super urgent !

Name three bad things that can happen to a teenager who has no refusal skills and no self-control: