Which of the following describes a cyclical change in an ecosystem?
a. an area receives less rain each year for many years.
b. the water level in lake ontario peaks and dips every few years.
c. coyotes migrate to an area where no coyotes lived before.
d. a population of juniper trees is replaced by poplar trees.

Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis

Study this image which statement best describes the rock shown check all that apply

Which of the following words best matches this definition: the process in which the best adapted organisms survive and pass on their traits, while those that are not well adapted do not survive to pass on their traits. question 3 options: acquired selection natural selection artificial selection organic selection