When would exposure to a potentially harmful substance be most likely to damage many organs in a developing embryo

Whic disease reduces bone density and causes the bones to become brittle

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

Hot5, endomondo, gympact, and runkeeper are popular a.) energy drinks b.) vigorous-intensity exercise c.) fitness apps d.) moderate-intensity exercise e.) fitness tests