<em>réponse</em>: <em>verdadero</em>
<em>Explication</em>:
The 
is an organ that supplies blood and nutrients to a developing embryo.
Explanation:-
- The placenta is a large temporary organ that develops in the uterus during pregnancy (in female mammals).
- Placenta allows for the exchange of materials between the mother's blood and the blood of foetus and also aid in removal of the foetus waste.
Answer:
Option A = 17.03 g/mol
Explanation:
Given data:
Atomic mass of nitrogen = 14.01 g/mol
Atomic mass of hydrogen = 1.008 g/mol
Molecular mass of NH₃ = ?
Solution:
Molecular mass of NH₃ = (14.01 g/mol × 1) + (1.008 g/mol × 3)
Molecular mass of NH₃ = 14.01 g/mol + 3.024 g/mol
Molecular mass of NH₃ = 17.03 g/mol
Ammonia consist of hydrogen and nitrogen both are nonmetals that's why ammonia is an covalent compound.
Carbonates, halides, native elements, oxides, silicates, sulfates, and sulfides.
Answer:
D. The atoms are arranged with alternating positive and negative charges. When struck, the lattice shifts putting positives against positives and negatives against negatives.
Explanation:
Metallic crystals takes their properties as a result of metallic bonds in between the atoms.
Metallic bond is actually the attraction between the positive nuclei of all the closely packed atoms in the lattice and the electron cloud jointly formed by all the atoms by losing their outermost shell electrons this is by virtue of their low ionization energy.
Physical properties of metals such as malleability, ductility, electrical conductivity, etc can be accounted for by metallic bonds.
