The cells in the stem of a plant often have thicker cell walls than the other parts of the plant in order to a. allow more light to penetrate through the stem. b. secrete water and oxygen through the stem. c increase gas exchange in the stem. d provide support and strength to the stem.

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Which muscle is responsible for inhalation ?

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