Mitochondria are known as the 'powerhouses of the cell' because they generate most of the cell's energy through the process of cellular respiration.

Carbon dioxide is a greenhouse gas that traps heat in the Earth's atmosphere, contributing to the greenhouse effect and global warming.

Water is a compound composed of two hydrogen atoms and one oxygen atom, represented by the chemical formula H2O.

Velocity is a vector quantity because it has both magnitude (speed) and direction.

Solar energy is a renewable source of energy derived from the sun's radiation.

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.

Insulin is a hormone produced by the pancreas that regulates blood sugar levels.

The skin is the largest organ in the human body, covering the entire surface and acting as a protective barrier.

Helium is a noble gas, characterized by its lack of reactivity and stable electron configuration.

Kinetic energy (KE) is calculated using the formula $KE = rac{1}{2}mv^2$, where 'm' is the mass of the object and 'v' is its velocity.

Budding is a type of asexual reproduction in plants where a new plant grows from an outgrowth or bud on the parent plant.

The chemical symbol for sodium is 'Na'.

Radio waves have the longest wavelength among the given options.

Cellular respiration is the process by which animals use oxygen to break down glucose and produce energy.

Hydroelectric power is a renewable energy source that harnesses the energy of flowing water to generate electricity.