15. Which of the following is an example of a pioneer species in secondary succession?
a. Lichens
b. Grass
C. Insects
d. Shrubs

that is true   : ) hope this you

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!

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

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements