What do comets and asteroids have in common?

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

The authors use the word “backbone” in lines 3 and 39 to indicate that

Technological solutions have good bad effects. what is one bad effect of spraying a chemical pesticide on crops