Which best describe fetus development? a.) the heart beats and is heard during the first trimester. b.) the heart beats and is heard during the second trimester. c.) the heart beats during the first trimester, but is heard in the second trimester. d.) the heart beats during the second trimester, and is heard in the third trimester.

The correct answer is:

A fetal heartbeat may prime be identified by a vaginal ultrasound as new as 5 1/2 to 6 weeks following gestation. That’s during a fetal pole, the first obvious sign of a developing embryo, can seldom be observed.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

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