Adenosine triphosphate also known as ATP is a chemical that helps give the body energy
A) Chargaff discovered two rules that helped to reveal the structure of the double helicon DNA. Chargaff's rules claim that the DNA from any cell and any organism should have a 1: 1 ratio (base pair rule) of pyrimidine and purine bases, and more specifically that the amount of guanine is equal to the amount of cytosine, and the amount of adenine is equal to the amount of thymine. This form was found in both DNA strands.
B) James Watson and Francis Crick in 1953 proposed the first correct model of the double helicon DNA structure. Their model was based on only one X-ray diffraction image recorded by Rosalind Franklin and Raymond Gosling in May 1952, as well as information that the DNA bases ware paired, which came out of private communication with Erwin Chargaff during the previous years. Chargéff's rules played a very important role in determining the configuration of double helices for B-DNA as well as for A-DNA.
Answers
1. True, trees shed their leaves during winter to survive the harsh winter.
2. True, some trees have leaves that are pointed needles to survive the cold.
Explanation
Trees lose their leaves during winter , during this period, the ground freezes making the soil to be dry as in desert, hence to reduce loss of moisture through transpiration that occurs via the leaves, the trees shed all leaves until warmer springs start. For example deciduous trees in temperate forest shed leaves every winter.
Needle like leaves can survive ice and snow during cold. Insects will not be able to feed on such leaves because of their toughness. In addition to that, needle shaped leaves have lower wind resistance thus can not easily make a tree fall over during big storms.
The answer is c. cluster.The most common type of distribution pattern in nature is clustered. That is because resources are patchily distributed in the environment. So, if resources are rare, or due to social factors, individuals would cluster together in the area where these factors are favorable.Random distribution is the least common type of distribution pattern and it is found in homogeneous environments, which are very rare.Regular distribution is the result of the competition for a resource or direct social interactions between individuals within the population, such as territoriality.
