What is the structural support of a jellyfish?

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

In what for do plants utilize nitrogen? why do they need nitrogen?

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian