What is the atomic mass number of an atom with 7 electrons, 7 neutrons, and 7 protons?
a. 7 daltons
b. 10 daltons
c. 14 daltons
d. 21 daltons
e. 28 daltons
C
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Which of the following experiments is the best way to determine if an element is essential for plant growth?
A) Measure the amount of the element stored in plant tissues. B) Measure the amount of the element in the soil after plant growth. C) Measure the weight of the plant and soil before and after plant growth. D) Grow a plant using hydroponics with and without the element.
Discuss the theory of secondary endosymbiosis and defend the theory by providing evidence that supports it
What will be an ideal response?
It is difficult to make a vaccine against HIV because
a. the virus mutates rapidly. b. it is too expensive. c. it is a retrovirus. d. not enough is known about it. e. it contains reverse transcriptase.
One goal of conservation biology is to prevent extinction caused by
A) asteroid impacts. B) predation. C) human activity. D) interaction of native species. E) disease.