Answer:
At about 38 weeks after conception, the fetal brain signals the release of hormones, specifically <u>oxytocin,</u> which prepares the fetus for delivery and begins labor.
Explanation:
Oxytocin is a hormone released by posterior pituitary gland because it is responsible for the uterine contractions during labour.
Fetal hypothalamus secretes corticotropin releasing hormone near term which stimulates fetal Anterior pituitary gland to secrete adrenocorticotropin hormone (ACTH) which stimulates adrenal cortex to produce cortisol which stimulates the secretion of estrogen from placenta, inhibition of P synthesis causing increased uterine contractions by cauisn increased oxytocin released from posterior pituitary gland.
my answer would be the 3rd one
my bad if i'm wrong
The modern model of atom is unable to show the speed of atoms which make it less sure about its improved version.
Explanation:
The atomic model has under-went a drastic change in the past few decades. The first model was developed by Demoncritus in 450 B.C. which was accurate about the existence of atom as matter particles but he was inaccurate about the divisibility of matters.
Many other scientists have developed various models of atom over time, they are- John Dalton(1800), J.J. Thompson(1897), Ernest Rutherford( 1899), Neils Bohr. Neils Borh talked about the nucleus in his model and about the electrons orbiting the nucleus. However, this modern model lacked the observation of the speed of electrons.
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