The skin of a poison-arrow frog produces substances that are very toxic. How might the bright skin colouration of such frogs evolved?

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

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

Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.