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

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence

Diffusion and osmosis are forms of passive transport