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In your biology lab, you use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal?

Which organ system is responsible for secreting hormones that signal lactation?

In animals, a sphere of embryonic cells surrounding a fluid-filled cavity is called a

The germ layer called the endoderm produces

A collective term for all plant tissues outside the vascular cambium is

Melanin absorbs UV radiation and can therefore protect against some forms of skin cancer. Which type of cells produce melanin?

When examining a mutant mouse, you notice that its skeletal muscle looks very uniform, lacking in striations. To figure out what the mutation is in this mouse, you would begin by looking at

Bacterial biofilms are important medically because they

Mammals that lay eggs are marsupials.

The primary function of muscle tissue is