You will also like...
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..
Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..