Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..
Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..
Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..
Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
