A herd of cattle is an example of OA.
a population.
OB.
a biome.
C.
a community
D.
an ecosystem.

The definition of a herd is a big group of animals or people who share the same characteristics. An example of a herd is a group of cattle, sheep or elephants who all live and travel together.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

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