What is the principal substance that causes phototropism in stems or leaves?

a. auxin
b. gibberellin
c. abscisic acid
d. ethylene
e. cytokinin

a

Biology & Microbiology

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If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?

A. 1 B. 100 C. 2000 D. 10,000 E. 20,000

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Nutrient-rich blood flows from the placenta to the fetus via the

a. ductus arteriosus. b. fossa ovalis. c. ductus venosus. d. foramen ovale. e. allantois.

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If a modern novel life-form were made, what would this tell us about LUCA?

What will be an ideal response?

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Which of the following systems is the only one to have direct interactions with the other three?

a. digestive b. urinary c. circulatory d. respiratory e. reproductive

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Biology & Microbiology