The of an object in free fall equals 9.8 meters/second/second

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

According to this food web which of the following would be considered primary consumers