If the net force on an object is zero then the object has

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

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

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million