Which of the following cell types are used in phloem?
A. Vessel elements-short, wide cells
B. Sieve-tube members-alive at maturity
C. Tracheids-hollow, tube like cells
D. Lignin-cells dead at maturity

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

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

Genetic orders can result when sister chromatids fail to separate properly during which phase is this problem most likely to occur