Which are the first cells to arrive at a bacterial infection? O A. Macrophages
O B. Antigens
O C. Lymphocytes
OD. Neutrophils

Which of the following is not a defining characteristic of plants?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

All ova contain sex chromosomes corresponding to: x y xx xy