... cover the tundra, and cacti dot the desert? • Trees turn carbon dioxide into oxygen that helps us breathe and reduces air pollution. • Trees also filter lots of other chemicals from our air and purify it making the air healthier for us to breathe. • They also provide shelter from the sun ... is sufficiently abundant - without being too abundant. Before the evolution of the plants that make up today's forests, more primitive species still shaped themselves into tree-like forms--like giant club mosses (today appearing as runners a few inches above the ground), tree ferns, and cycads (...

• Word Count: 2774
• Approx Pages: 11
• Grade Level: High School

... wouldn't be able to be made without the use of meristem, because there are no apical meristem, the meristem cells are located in the Vascular Cambium. The Vascular Cambium is a thin layer of meristem cells, that produce Secondary Xylem as well as phloem and is an integrate part of the plants ability to expand. While the trees Vascular Cambium is producing ... no way of replacing the phloem that was removed. The roots would be starved of food and the endodermis would collapse. As a result of this, the xylem would start sucking air up to the leaves and transpiration would halt because of ...

• Word Count: 928
• Approx Pages: 4
• Grade Level: High School

... are ones that experience intense drought or extreme cold. Desert animals cope with heat and water shortage by remaining below ground by day. In tundra and on polar ice, winter air temperatures can fall to below -40 C (-40 F). The few animals that do remain active on land or ice during winter, such as seals and male emperor penguins, rely on ... numbers of spores. A giant puffball, for example, produces an estimated 7 trillion spores. Classification: primarily the type of spores and fruiting bodies produced classifies Fungi. The Fungi Kingdom can be divided into four main categories: Chyt...

• Word Count: 2632
• Approx Pages: 11

... moves out of the soil, it first enters the plant through the root epidermis. The epidermis sucks water in. They have very thin root hairs to make it easier to absorb water from a larger surface area. More surface area to absorb increases the possible amount ... , the epidermis secrete protective coating. The spores and pollen also have a protective coating, or sporopollenin, a sealing material that permits their dispersal by air currents without the danger of drying. As plants get bigger and older, they need meathods of insuring a sufficient supply of water and carbon dioxide ... grow,...

• Word Count: 3790
• Approx Pages: 15
• Grade Level: High School