I think it is organic compounds
What the person said above me
D. Hypotheses is the correct answer
Respiratory- You breath faster to help supply the muscles with more oxygen.
Integumentary (skin) - Sweat helps cool down the body.
Explanation:
<h3>Length = 2cm</h3><h3>breadth = 5cm</h3><h3>height = 2cm</h3><h3>volume of metal = 2×5×2 = 20cm^3</h3><h3>density = 2 g/cm^3</h3>
<h3>density = mass / volume</h3><h3>mass = density × volume </h3><h3>mass = 2 × 20</h3><h2>mass = 40kg </h2>
<h2>I HOPE THAT THIS ANSWER HELPS YOU </h2>