It is usually caused by the forces of gravity
Brainliest?
Answer: mutation
Mutations are changes to an organism's DNA and are an important driver of diversity in populations. Species evolve because of the accumulation of mutations that occur over time. The appearance of new mutations is the most common way to introduce novel genotypic and phenotypic variance.
Ocean currents are convection
Answer:
A) effect of sugar on a metabolic activity of yeast
Explanation:
In this experiment, everything was kept the same except for adding sugar into one test tube and none on the other. The data that was recorded was the bubble formation. Bubble formation is an indicator for a chemical reaction and in this case it is the metabolic activity of the yeast.
Everything that is kept constant like the amount of yeast suspension, temperature and time it was placed in the warm water bath are what we call controlled variables. This is done to prevent any other variables from affecting what is being tested.
The amount of sugar is what is different and this is called the independent variable. This is what we are testing to see if it will have an effect.
Finally, bubble formation or metabolic activity is the dependent variable. This is what will be observed as a result of the changes in the independent variable.
A) One species always outcompetes the other until only one species remains.