A, the endosymbiotic theory tells us that a looooong time ago, when there were only one-cell organisms, they kind of took in a bacteria. They profited from having a bacteria in it ( and I believe it is believed that this made it possible for organisms to have multiple cells, not sure) and these bacteria became mitonchondria/chloroplasts, thus answer A is the only one that doesn't support this theory.
Frequency is the term that describes the number of waves passing a point during a certain period of time, frequency is also measured in Hz (hertz).
True because when you have a gene it replicates.
Answer:
leaky or null mutation
Explanation:
It impairs a certain characteristic or function in the mutant, rather than eliminating it completely
Correct answer: 1 calorie.
By definition, the amount of energy that passes from a lower level to the next higher level on a food chain is about 10% of that that was at that level. So, if there are 1000 calories in an autotroph level, the next level, primary consumers, will get 100 calories from it, the secondary consumers, 10 calories, and the tertiary consumers, 1 calorie.