Natural Factors:
Ocean Currents, Distance of the Sea, Wind Directions, Topography, Your country's distance from the equator , Volcanic Eruptions, The sun, and especially humans.
Answer:
Stage IV - There is a primary tumor, lymph node involvement and metastases.
Explanation:
Staging is the extent of spread of tumor within the patient.
The American Joint Committee on Cancer (AJCC) divides all cancers into Stages 0 - IV, incorporating into each stage several TNM (tumor/node/metastasis) stages usually with the same prognosis.
Staging is essential in determining the patient prognosis.
The approximate 5-year survival rate for colorectal cancer patients of all stages is 64.4% (In the United States) and survival is inversely related to stage.
Surgery usually provides the only curative option for patients diagnosed with Stage IV colon cancer.
Evoultion is the change of the allele frequencies and the inherited traits of a population over time.
The idea of evolution is that the species change over time. The proposed mechanism of evolution is natural selection. Natural selection favors inheritable trait, suitable for survival and reproduction. Organisms with such traits will tend to leave more offspring than others, and thus will evolve over time.
Answer:
The missing options are:
A. Spindle fibers have not correctly attached to chromosomes.
B. Damage occurred to DNA when it was being copied in G1.
C. There are not enough nucleotides available to construct new DNA.
D. Proteins necessary for M phase of the cell cycle have not been produced.
The correct option is <u>C.There are not enough nucleotides available to construct new DNA.</u>
Explanation:
During the G1 phase, the cell grows in size since it prepares its organelles and molecule combinations for the next phase of the cell cycle, the S phase. Before the cell transitions to the S phase, it has to pass through a checkpoint that makes sure that there are no mutations, it has grown enough, and has the necessary molecules for the next phase, which is the synthesis of DNA. If there are not enough nucleotides, the cell will not be able to synthesize new DNA in the S phase, so the checkpoint stops the cells from moving to this phase till it has all the necessary things to do it.
