What change must have occurred during the evolution from invertebrate chordates to vertebrate chordates ?

What type of competition exsist between two species. turtles and fish

Which statement best compares aerobic and anaerobic respiration

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.