The function of the heart is to move deoxygenated blood from the venous system through the right heart into the pulmonary circulation and to move oxygenated blood from the pulmonary circulation through the left heart into the systemic circulation.
There's sexual reproduction and asexual reproduction. Sexual reproduction involves both male and female in order to reproduce, while asexual reproduction involves an organism reproducing on its own without the help of another partner.
A. Photosynthesis to generate energy
If two forces act on an object in the same direction, the net force is equal to the sum of the two forces. This always results in a stronger force than either of the individual forces alone.