What human body system sends signals to glands in the endocrine system to release hormones?
a. circulatory system
b. excretory system
c. nervous system
d. digestive system

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

Convert 9.75 millimeters to centimeters. centimeters

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.