What allows for the more complex morphology of humans relative to those of simple invertebrates such as nematodes?

The answer is; endoskeleton

An endoskeleton allows for smooth and steady growth unlike in an invertebrate with an exoskeleton that needs to shed their skeleton during irregular growth spurts. An endoskeleton is significant for leveraging (like an anchor) skeletal muscles hence enabling the animals to grow big and is able to support their own weight.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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.