Fill in the blanks. Photosynthetic life changed the by producing large amounts of and this in turn allowed for to evolve on Earth. Soil microorganisms known as created fertile which is part of the . This allowed for to evolve. Stromatolites created in the which changed erosion, deposition and created many homes for organisms. This increased the of life.

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.