Cyanobacteria helped produce O2. Because it helped releasing O2 into the atmosphere, today we see different animals because Cyanobacteria helped reduce the poor oxygen in the atmosphere.
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. Mark me brainliest please?
The primary inspiratory muscles are the diaphragm and external intercostals. Relaxed normal expiration is a passive process, happens because of the elastic recoil of the lungs and surface tension.
Vitreous: having the appearance of glass
Resinous: having the appearance of chewing gum
Pearly: light reflects from the mineral giving different colors very similar to a pearl
Earthy
: dull, non-reflecting surface