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The chorion develops into the PLACENTA, a pancake-like structure that is attached to the endometrium and is about 7 inches in diameter and 1-2 inches thick.
Placenta is an organ present inside the uterus that contains the fetus and connects the fetus to the uterine wall of the mother. The fetus derives all the nutrients and food from the mother with the help of placenta.
Answer:
B. 26amu
Explanation:
The nucleus of an atom in an element contains protons, electrons and neutrons. The proton number equals the electron number in a neutral atom. The proton number is also called the atomic number, denoted by Z.
The mass number also called Atomic mass unit (amu) in this case, of an element is the sum of the proton number and the neutron number in the atom of that element. The mass number is denoted by A.
Hence, A = Z + N
Where A = Mass number
Z = Proton (atomic number)
N = Neutron number
In this question, N is 11 while Z is 15
Hence, the mass number of the element in the question, in AMU, is 15 + 11 = 26amu.
Answer:
OB. The life expectancy of similar organisms
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