During pregnancy and delivery, a hormone called relaxin is secreted to "relax" (soften) the pelvic ligaments and cervix. what pelvic girdle region would be a good target for this hormone to open up the anterior pelvis during the birthing process?
1) pubis
2) ischium
3) ilium
4) sacrum

1) pubis

Explanation:

The pelvic girdle is made up of two hipbones, sacrum and coccyx. The hipbones also called coxal bones has three parts: ilium, ischium, and pubis. Pubis makes the anterior and inferior part of the hip bone. The joint between two pubes of hipbones is called pubic symphysis. Placenta of pregnant women produces more relaxin during later stages of pregnancy to facilitate childbirth. The hormone relaxin increases the flexibility of pubis symphysis to ease the delivery of the baby by dilation of the uterine cervix.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: