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
Biology & Microbiology
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
Biology & Microbiology
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.
Biology & Microbiology
If a modern novel life-form were made, what would this tell us about LUCA?
What will be an ideal response?
Biology & Microbiology