The shell of an egg needs to be big enough to keep the chick inside until it is ready to hatch. The "Egg" you see is not a single cell. The cells are inside the shell you see. These single cells are like normal cells, you need microscopes to see them.
One cell does it all. Breath, Eat, Excrete, Grow and Reproduce. One cell. Smaller than anything we can see unaided.
it is an egg.
One example would be the red blood cell, though in some animals such as birds they do have a nucleus per cell.
No,they get from outside.They are transported through membrane.
Diffusion (of oxygen( through their cell membrane or cell wall
You can define a cell site as a single site that has a cell phone traffic through the single site. You can find this information online in encyclopedias such as Wikipedia.
yes
The smallest size of a cell that can be seen with the unaided human eye is about 100 microns, which is roughly the size of a grain of sand. Anything smaller than that would generally require a microscope to be visible.
36 ATP molecules can be produced from a single molecule of glucose through the complete process of cellular respiration.
A single-cell organism obtains oxygen through simple diffusion across its cell membrane. It acquires food by engulfing or absorbing organic molecules from its environment. These nutrients are then used for energy and growth.
Zygote
Zygote