Which two organ systems work together to perform gas exchange and deliver oxygen to the rest of the body? A. Digestive & cardiovascular
B. Respiratory & cardiovascular
C. Respiratory & excretory
D. Skeletal & muscular

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

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes