Answer:
Lived during the time of dinosaurs.
Explanation:
Both types of trees have existed since the time of dinosaurs or earlier.
Since the other answer got deleted, i'll just answer it for you.
a sinoatrial node is the main pacemaker that begins each heartbeat located in the junctions of superior vena cava and the right atrium. It signals from the node that spread through the atria and determines the heart rates.
Answer:
Nerve cells are called neurons . They are adapted to carry electrical impulses from one place to another. ... at each end of the neuron are tiny branches (dendrons ), which branch even further into dendrites . The dendrites receive incoming nerve impulses from other neurons
