Question

which of the following correctly places the organisms in chronological order, according to when they appeared in the fossil record? mollusks → millipedes → giant dragonflies → pterosaurs pterosaurs → millipedes → mollusks → giant dragonflies millipedes → mollusks → pterosaurs → giant dragonflies mollusks → pterosaurs → millipedes → giant dragonflies giant dragonflies → millipedes → mollusks → pterosaurs

Explanation:

Mollusks are some of the earliest - appearing multicellular organisms. Millipedes appeared later than mollusks. Giant dragonflies evolved after millipedes. Pterosaurs are reptiles that appeared much later in the geological time - scale.

Answer:

Mollusks $\longrightarrow$ millipedes $\longrightarrow$ giant dragonflies $\longrightarrow$ pterosaurs