During which period did mammals first appear? a. pleistocene b. carboniferous c. cretaceous d. jurassic

Which skeletal system is represented by the shaded portion of the skeleton? spongy skeleton compact skeleton axial skeleton appendicular skeleton

Describe the impact of deforestation of both abiotic and biotic factors within the tropical rainforest.

Which one is an advantage of external fertilization a. the offspring are genetically identical to the parents b. more eggs can be fertilzed at one time c. more sperm can be released at one time d. more protection is available for developing plz