The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..
Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..