<span>New combinations of genes may be produced by </span>immigration, mutation and sexual reproduction. These new combinations are also called variations.
This statement is true. Early land animals indeed had gills as well as lungs. It is generally known that amphibians breathe through their skin, like how the lungs needed the skin for its respiratory. Fish have gills for breathing while mammals do have their nasal cavity and lungs for their gas exchange.
The Right Ventricle sends deoxygenated blood to the lungs
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Answer:
An area with an uneven distribution of food, water, moisture, temperature, or other resources can cause clumped dispersion. This pattern can also be caused by the formation of social groups based on protection or hunting. In plants, clumped dispersion is common when offspring fail to disperse from parent plants.
