Answer:
Due to presence at early days of the planet.
Explanation:
We only find the remains of single celled organisms in the oldest fossils because the single celled organisms are the organisms that were present in the early days of this planet. These single celled microbes were present about 3.7 billion years ago while on the other hand, the oldest rocks are only a little older i. e. 3.8 billion years so these single celled organisms are considered as oldest fossils on this planet.
The last one, " Scientists predict a volcano will erupt based on current volcanic activity." This one is false because they actually predict a volcanic eruption by the volcanic waves and other complicated things.
B. 245 million
from the end of Carboniferous Period to the beginning of the Triassic period
The right answer is Carbon fixation
Rubisco (or ribulose-1,5-diphosphate carboxylase / oxygenase) is a plant enzyme involved in the Calvin cycle and more particularly in the fixation of carbon dioxide.
Rubisco, located in chloroplasts, is the most abundant protein in plant biomass and even in total biomass.
Answer:
could be either or, but the name of the shape is a double helix.
Explanation: