All of these are evidence of a common evolutionary ancestry for cell signaling except 1. both bacteria and eukaryotic cells have receptors for intercellular signaling in their cell membranes

2.both plant and animal cells participate in cell junctioning

3. both plant and animal cell plastids code for cell membrane receptors

4. both unicellular bacteria and yeast have complex cell-signaling systems that use chemical messengers

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

Mr. olajuwan was in a horrific snowmobile accident. afterwards he had trouble walking and he had a loss of balance. which of the 4 major brain region was probably demaged

In a cladogram' when does a group of organisms branch off