Smoking is known to induce mutations in a particular gene (let's call it gene X) with a key regulatory role in the cell cycle. This mutation in gene X can be detected by isolating cells from the sputum (fluid coughed up from the lungs) of many smokers, and is used as a hallmark to diagnose lung cancer. Which of the following gives a most likely explanation for the relationship between a mutation in gene X and the development of lung cancer? a. gene X codes for a protein that initiates the entry of cells into M-phase of the cell cycle.
b. gene X codes for a protein that allows the entry of cells into S-phase after making sure that all the necessary building blocks and nucleotides have been made by the cell during G1 phase.
c. gene X codes for a protein that plays a role in the formation of the cleavage furrow during cytokinesis.
d. gene X codes for a protein that plays a role in the entry of cells into S-phase of the cell cycle.
e. gene X codes for a protein that prevents cells from entering M-phase until all errors encountered during DNA replication are corrected.

relationships aren't everything. people everyday spend there entire life depending on reltionships and for someone to be there for them when this is absurd. why must people depend on someone else to bring them happiness? i'm not saying it wrong to feel happy with someone, but people feel that they need to be in a relationship in order to feel happy, when, this is not true. you can paint, write, read ir slend tume with family ir even spend time working in yourself. this can be an exciting experience to find yourself. it's bot wrong to be in a relationship but if you let it be your only source of happiness, than you will never find true happiness.

so, relationships are not always worth it. if you are so dependent on them, than in the end they arent worth it because you will realize how unhappy you really were. some people even tend to cut ties with family because they think they cabt make them happy, obly realtionships with a lover can. false. in order to find true happiness, one must learn to love themselves if they want to love someone else. it's unhealthy to be always depend on relationships and to alqays be in and out of one.

so live life, get that job you always wanted, buy those new shoes and love yourself. depend on yourself, not others. they arent worth it, you can make yourself more happier than most people can do to you. it's not woth it. take your time and have fun.

answer; ///(b) it is composed of four protein chains and four heme groups;

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest

a. by using fur or clothes to trap heat energy near the body