A ___ center benefits children through the inclusion of menus, invitations, signs, and posters.

A. science
B. math
C. block
D. housekeeping

What percentage of the earth's water is available for use by living things?

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.