Answer:A
Explanation:circulatory system functions
The reason why nost scientists thought that the first true cells formed on Earth were anaerobic is being shown in the second option :B. because there was no oxygen on early Earth. Paying attention to this fact scientists discovered that first cells were prokaryotes and greatest part of them created oxygen as a toxic by-product of their own metabolism which make them understand how the planet was provided with oxygen and made a conclusion that first cells were anaerobic.
well power is equal to work multiplied by time so .. 900j divided by 15 s will give you 60 Watt as your answer
Answer:
A.. Water would not be able to climb up inside plants