nondisjunction happens
Explanation:
The loss of a single chromosome from a diploid genome is called monosomy while the gain of one chromosome is called trisomy
Answer: Tetrapods
Explanation:
Tetrapods are the most recent common ancestor with the lungfish look like.
Ancient species of lung fish are the ancestors of tetrapods. These fish may live on land, breathing air and being propelled by their pelvic fins. Australia has three populations of the few remaining lungfish — two marine populations and one inhabiting the Mary River basin in Queensland.
Hence, tetrapods are most common ancestors with lung fish.
Answer:
C. Independent variable
Explanation:
The independent variable in an experiment is the variable that the experimenter manipulates or changes in order to effect a measurable response in the dependent variable.
According to this question, an experiment is conducted to determine what concentration of disinfectant is most effective in killing bacteria. The independent variable is the CONCENTRATION OF DISINFECTANT because it is the variable being changed or manipulated.