Which components of an atom do not have a charge?
What will be an ideal response?
neutrons
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Why are the laws of thermodynamics considered laws of nature and not scientific theories?
a. We do not understand how or why energy behaves the way it does. b. We understand why energy behaves the way it does, but not exactly how it behaves. c. We understand how energy behaves, but not exactly why it behaves the way it does. d. We cannot be absolutely sure that energy will behave the same under all conditions. e. We have a complete scientific explanation of energy behavior.
The convergence in external morphology of sharks,
penguins, and porpoises is attributed to a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. use and disuse of the limbs.
What are the three tissue systems of plants contained in each plant organ, such as leaves?
A) Dermal, cell wall, and vascular tissue systems B) Ground, germ, and vascular tissue systems C) Dermal, ground, and vascular tissue systems D) Ground, mesophyll, and vascular tissue systems
Which of the following statements concerning nucleic acids is CORRECT?
A) Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates. B) Cellular DNA is double stranded. C) All viruses have DNA genomes. D) The nucleic acid polymer is composed of peptide bonds. E) There are three naturally occurring purines in nucleic acids.