Aflexible, supporting structure found only in chordates is the

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol