Question 9 How does a substitution mutation affect the DNA sequence?
a
Nitrogenous bases are added, causing a frameshift.
Nitrogenous bases are exchanged, altering the amino acid sequence.
Nitrogenous bases are removed, causing a frameshift
Nitrogenous bases are damaged, causing no protein to be made.
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m

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

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