Consider the cladogram.

mc013-1.jpg

according to the cladogram, which organisms have roundworms as a common ancestor?
mollusks and flatworms
sponges and chordates
flatworms, sponges, and cnidarians
mollusks, echinoderms, chordates, and annelids

9. wind power creates pollution. water air soil noise

When analyzing tree rings, what do scientists assume a thin ring indicates?

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point