Answer:
It is essential for all living things. Fixation: In order for organisms to use atmospheric nitrogen (N2), it must be “fixed” or converted into ammonia (NH3).
Explanation:
Answer: A. The genes encode resistance to antibiotics.
D. The genes are carried on plasmids
F. The "clock"genes are highly mobile between species.
Explanation:
Molecular clock is a tool that is used to calculate the time of the evolutionary events. These are the gene sequences that are used to determine the evolutionary distance between the new and primitive organisms developed on earth. It also measures the random changes just like mutation. Thus the molecular clock is also called as the gene clock or evolutionary clock.
The accuracy of the molecular clock can be increased by the genes that encode for a resistance against the antibiotics, the genes that are carried on the plasmids and the clock genes which are highly mobile among the species.
The physical appearance of an organism is its phenotype which is determined by genotype and the environment. A phenotype is the composite of an organism's observable characteristics or traits, such as its morphology, development, biochemical or physiological properties, behavior, and products of behavior. Genotypes on the other hand are the set of genes in our DNA which is responsible for a particular trait.
Use this:
pH = 7 => neutral
pH > 7 => basic (alkaline)
pH < 7 => acidic
So, a pH of 7.6 means the soil is alkaline.
Now, to reduce the impact you should lower the pH.
Sulfur forms acid (H2S or H2SO4) which will lower the pH.
So, adding sulfur will result in the (at least partial) neutralization of the pH and so reduce the impact on plant growth.
Answers: 1) alkaline, 2) sulfur.
The central nervous system is composed with brain and spinal cord, this is where the nerve impulses come.
The peripheral nervous system is composed with the nerves which comes from the central nervous system and go to the different organs like skin and muscles, its role is to conduct the nerve impulses.
