During which period did the first land vertebrates appear? a. devonian b. mississippian c. pennsylvanian d. permian

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

What is the genotype of the male circled in pink? ο χου lo xay xaya done answer was xay