An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?
A. It cannot be determined.
B. 19
C. 45
D. 64
Ans: C. 45
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A researcher has been studying columbine in a meadow over the last decade. During that time, she has noticed that columbine flowers have gone from producing long nectar spurs to very short nectar spurs
What can the researcher deduce from this observation? Select all correct choices. A. That the columbine in the meadow has evolved to accommodate new pollinators. B. That the columbine in the meadow has access to more nutrients. C. That there are more bees visiting the meadow compared to moths. D. That new species of columbine may have emerged in the meadow.
The causative agent of whooping cough is ________.
A. Bordetella pertussis B. Campylobacter jejuni C. Bartonella henselae D. Ehrlichia chaffeensis
A(n) ________ protects the internal organs of ray-finned fishes
A) exoskeleton made of cartilage B) notochord C) internal bony skeleton D) exoskeleton made of chitin E) internal cartilage skeleton
Cortisol and aldosterone are secreted by the ________
Fill in the blank(s) with correct word