Answer:
Consider substances that can easily diffuse through the lipid bilayer of the cell membrane, such as the gases oxygen (O2) and CO2. O2 generally diffuses into cells because it is more concentrated outside of them, and CO2 typically diffuses out of cells because it is more concentrated inside of them.
The correct answer is d. 3.5 billion years.
Prokaryotes were the first forms of life on Earth long before simple multicellular life appeared because of their ability to withstand extreme conditions. It is believed that the first living forms were bacteria combined with archaea in the microbial mat (multi-layered sheet).
Answer:
a. the reindeer population exceeded it carrying capacity
Explanation:
not enough food for the reindeers due to an increase in deer population.
Answer:
No
Explanation:
The Sun is a star there are lots of stars,but the Sun is the closest one to Earth.It made from gases and it always burning
Planets are:Mercury, Venus, Earth, Mars, Jupiter, Saturn, and Uranus
