Explanation: The shape of a river's stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water's motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water's motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.
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<span>Best source of data for defining phylogenetic relationships of in line of protists that occurs hundreds of millions of years ago is called DNA sequences for ribosomal RNA. Choose the tree that symbolize the fewest evolutionary changes, either in DNA sequence comparisons or morphological characters. </span>
(BIRDS)
were the first they had feet the wings
Answer:
1. Epidermis (outermost)
2. Skin
3. Cuticle
4. Stomata
5. Inhibit water loss and protect the leaf
Explanation:
1. The dermal layer of the plant is called Epidermis which is the outermost layer of the plant leave made up of several
2. Ther dermal layer in plants is like skin of human which also made of three different layer knwon as epidermis (outermost), dermis (middle) and subcuatneous (deepest).
3. A waxy barrier present at leaf surface is called cuticle which provide protection against mechanical injury to the plant.
4. Stomata are the tiny holes present in the leaf surface that regulate the exchange of gases and water loss through its opening an dclosing mechanism.
5. The main function of epidermis is to provide protection to the plants from any mechanical injury and prevent water loss.
Hence, the correct answers are Epidermis (outermost), Skin, Cuticle, Stomata, Inhibit water loss and protect the leaf
