What discovery was made by alvin? a. over 4000 new species of marine lifeb. hydrothermal ventsc. the aqualungd. the temperature of different parts of the ocean

 The correct answer is :  b.  hydrothermal vents

Explanation:  A hydrothermal vent is a fissure at the bottom of the sea from which geothermally heated water flows. These vents are generally located near volcanically active places, also in places where tectonic plates are separating. Alvin is a deep immersion vehicle of the Woods Hole Oceanographic Institution.

theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.