Please help me!! Nondisjunction conditions in humans can cause genetic diseases such as Down syndrome. State the number of chromosomes and the characteristics that are found in an individual with Down syndrome.​

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.