Which is an example of an internal stimulus?

a sudden change of air temperature

a decrease in oxygen levels in the blood during exercise

an artificial light that attracts insects

an increase in the amount of water available to a plant

The response is the basis for vaccination. primary secondary tertiary none of the above

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

Which major eukaryotic lineages form the bikonta, a monophyletic group characterized by two flagella as a synapomorphy?