The element present in the center of the chlorophyll molecule is: MCQ with Answer and Explanation

Explanation:
Relaxin, produced by the corpus luteum and placenta, softens and relaxes the pelvic ligaments and pubic symphysis to facilitate childbirth. Oxytocin stimulates contractions.

Explanation:
The placenta begins to form immediately after implantation of the blastocyst. By the end of the first trimester (around 12 weeks of gestation), the placenta is fully formed and takes over the primary role of hormone production (progesterone and estrogen) from the corpus luteum. It is fully functional in providing oxygen, nutrients, and waste removal for the developing fetus for the remainder of the pregnancy. It is not fully formed at conception, nor does it wait until the second or third trimester.

Explanation:
The genetic code is a sequence of nucleotide triplets in mRNA called codons. Each codon consists of three consecutive nitrogenous bases and specifies a particular amino acid or a stop signal during protein synthesis. For example, AUG is the start codon (methionine). Anticodons are the complementary triplets found on tRNA molecules.