When does a seed become a seedling? When a flower forms
When photosynthesis begins
When a stem forms
When it has roots

Which type of stimulus do mechanoreceptors detect? sound pain heat light

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above

There are only about 250,000 known fossil species. true or false