Annelids, like the earthworm, and arthropods, like insects or spiders, have three main structures in their nervous systems:
a brain, a dorsal nerve cord, and a ventral nerve cord
a brain, segmented ganglia, and a ventral nerve cord
segmented ganglia, a dorsal nerve cord, and a ventral nerve cord

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses