Which organism provides energy to all other organisms in this ecosystem?

a. prairie dog

b. prairie grass

c. vulture

d. coyote

What does x represent in the formula for the compound xcl4?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?