8. Which of the following can be used to determine the composition of a star? O A. Light from sunspots
O B. Line spectra
O C. The star's magnetic field
D. Blackbody spectrum

Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

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