What is the inner layer of cells that forms the gut and respiratory system in animals?

endoderm

blastula

mesoderm

ectoderm

The correct answer is: Endoderm

en·do·derm

the innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.

blas·tu·la

an animal embryo at the early stage of development when it is a hollow ball of cells.

mes·o·derm

the middle layer of an embryo in early development, between the endoderm and ectoderm.

ec·to·derm

the outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis and nerve tissue.

Hope this helped you! :3

answer: 4

explanation: 8

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.