Answer:
3,500,000,000,000 (3.5 trillion) fish
Explanation:
The particles are moving in a Passive Transport which it does not use energy.
Answer:
There is two main kind of historical sources such as:
Primary sources, it may be oral or hand-written, it is generally which is originated in the past, it can be eye witness or chronicle or observer living during a particular historical era.
Secondary sources, on the other hand is the information gathered by someone who did not actively take part in or witness a historical event, secondary sources include such as articles, magazines, popular history textbooks, etc.
Explanation:
Please mark as brainliest
Out of the choices given, one adaptation that is unique to marine mammals is they can slow their own heartbeat down.