In which structure do monotreme embryos develop? a. a placenta
b. an egg
c. a yolk
d. a pouch

The correct answer is B. Monotreme embryos develop in an egg.

Explanation:

Monotremes are the mammals that, like the platypus, develop in eggs. Thus, this class of mammals is the only one with this condition, which is shared with reptiles and birds.

Monotremes are considered to be animals with a prehistoric development, so this characteristic of being developed in eggs is a condition that originates in the historical period in which these animals emerged.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.