Structures involved in blowout fractures include the
1. orbital floor
2. inferior rectus muscle
3. zygoma
a 1 only
b 1 and 2 only
c 2 and 3 only
d 1, 2, and 3

D) 1, 2 and 3

Explanation:

The floor of the orbit is the structure involved in the fracture by Reventon. On both sides of the face at the level of the midline we find the orbital cavities responsible for housing the eyeballs and their annexes. The zygomatic bone is part of the orbit floor. With orbital floor fractures, the prolapse of the orbital fat in the maxillary sinus can be considerable and the lower rectus muscle is equally compromised.

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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: d

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: d

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.