Because there are 64 possible codons and only 20 amino acids:
a. many mutations have no effect on phenotype.
b. every mutation has some effect on phenotype.
c. each trna molecule contains two extra codons.
d. each trna molecule contains two extra amino acids.

Option A

Explanation:

There are 64 possible codons, out of which 61 codons code for particular amino acid and three codons are stop codons. As there are 61 codons for 20 amino acids, some of the amino acids are coded by more than one codons.

Due to this many mutations cannot show their phenotypic effect. For example, if an original codon UUA  gets converted into UUG due to a point mutation, there would be no noticeable change seen in the phenotype of the organism because both of the codons code for the same amino acid, leucine.

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; i believe its (ovulation);