What could contribute to a mass extinctions event

What might explain the real-world results, show in the graph to the right, for one class of twenty students? check all that apply.

How does the closing of the ductus arteriosus and ductus venosus alter circulation in an infant? a. increases blood flow to the pulmonary artery and increases blood flow to the umbilical vein b. increases blood flow to the pulmonary artery and reduces blood flow to the umbilical vein c. reduces blood flow to the pulmonary vein and increases blood flow to the umbilical artery d. reduces blood flow to the pulmonary vein and reduces blood flow to the umbilical artery

1. using two to three sentences, summarize what you investigated and observed in this lab. 2. what building material did you use to build your house? did your results support or fail to support your hypotheses?