Label the tissue layers of the small intestine 1. Serosa.
2. Outer-longitudinal.
3. Sub-mucosa.
2
4. Mucosa.
5. Intestinal villi.
6. Lumen.
What type of cross-section is this?
2 m
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Which identifies the main purpose of biological taxonomy?

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.