Answer:
Scientists have used comparative embryology to study and gather evidence of evolution. Karl Ernst von Baer, a Russian scientist, made observations on embryos of different species and came up with four principles of comparative embryology: 1. General features of an embryo appear before specialized features.
Explanation:
The correct answer is salivary glands.
Salivary glands are exocrine glands which means that they release their product onto epithelial structure by the duct. There are three major types of salivary glands in h<span>umans: parotid, submandibular, and sublingual as well as hundreds of minor salivary glands. Beside the function of digestion (secrete the enzyme amylase, which hydrolyses starch into maltose and dextrin<span>) those glands have a protective role </span></span>
Answer:
The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac. The muscles in the body support movement, help maintain posture, and circulate blood and other substances throughout the body. ... It pumps out 2 ounces (57 grams) of blood with every heartbeat.
Explanation:
