Answer:
For early earth, it was filled with loads of oxygen and could kill humans if they breathed the oxygen that was in the air about 100 million years ago. This massive amount of oxygen cause massive creatures like the dinosaurs to exist. Current earth has an atmosphere with not too much oxygen.
Explanation:
brainliest
Cellular respiration is the process by which organisms use oxygen to break down food molecules to get *chemical energy *for cell functions.
The protest that is present in
toothpaste belongs to the phylum Chrysophytes species Diatoms. It has a
flexible cell membrane which is made of silica. This will help them keep their
cells shape, provides protection and helps keep water in its body.
Answer:
Invertebrates can have bilateral or radial symmetry, or they can be asymmetrical. Bilateral symmetry means that the animal is arranged in the same way on both sides. Radial symmetry means the body parts are arranged in a circle around a central point.
Answer:
False
Explanation:
A virus (which is a pathogen) has a lot of antigens on its surface, so they can't be used interchangeably.
