momentum
1. (Science: mechanics) The quantity of motion in a moving body, being always proportioned to the quantity of matter multiplied into the velocity; impetus.
2. Essential element, or constituent element. I shall state the several momenta of the distinction in separate propositions. (Sir W. Hamilton)
Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..
Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..
Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..
Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..
