According to the scientific article, 'cancer as an evolutionary and ecological process' (merlo, et al, 2006) -why might the concept of evolution by natural selection be useful in understanding the biology of cancer? select two of the following answers

a. a cancer is too intractible and difficult to understand witness the lack of progress in 100 years of fighting it.
b. cancer therapies select for cancer stem cells with resistance mutations.
c. there is evidence for competition, predation, parasitism, and mutualism between co-evolving clones in and around a cancer neoplasm.
d. cancer is always an example of viral predation on higher eukaryotes.

amber has allowed scientists to study dna that has been preserved over millions of years.

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )