The sugar and phosphate bond is placed outward of the DNA towards the solvent and the base of nitrogen is inside the helix.
Explanation:
The edges that are outward to the double helix formation of DNA are composed by sugar and phosphate molecules and make the backbone.
These two strands of DNA is placed in the opposite direction from the helix. But the nitrogen base is there inside the helix. It shapes like a ladder rung because of the hydrogen bond. This bond keeps the backbone held together.
The correct answers is : <span>They allow the exchange of gases between cells in the leaf and the external environment
The stomata are small openings that can be found on both the upper and the down part of the leaf and they are connected to the plant's vascular system.
These openings enable the plant to get rid of excess water in the form of vapor and to take CO2 from the atmosphere that is essential for the process of photosynthesis. </span>
Answer:
Soil erosion is a naturally occurring process that affect all landform. One uss of minerals is Copper
Answer:
They are genetically identical to the parents and only differ if a genetic mutation occurs.
Sexual reproduction involves two parents and produces offspring that are genetically unique.
The greater the genetic variation, the better change that an individual in the population have a favorable gene that can help survival. Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.
Explanation:
Answer:
contract
Electrical impulses from the brain tell the muscles to contract which moves the parts which causes pressure which squeezes the blood through the valves.
hope this helps xD
