Biology
Which plant cells give support to plant body?

Phloem cells
Xylem cells
Parenchyma cells
Sclerenchymatous cells

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Biology
Which of the following is true about veins?

Veins have a smaller diameter lumen than arteries
Veins are more muscular than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have valves; arteries do not

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Biology
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

You need an antiseptic, not an antibiotic
You need to be vaccinated instead of taking an antibiotic
Having waited a day, it is too late to take an antibiotic
You are infected by a virus

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