The vestigial structures in animals
for example we, humans once had a tail that is connected to our tail bone coccyx and every mammals you see had a tail.
Answer:
A plant cells contains a large, singular vacuole that is used for storage and maintaining the shape of the cell. In contrast, animal cells have many smaller vacuoles. Plant cells have a cell wall as well as a cell membrane. In plants the cell wall surrounds the cell membrane.
The laboratory is full of chemicals and other hazardous substances. So, it is very important to keep all the safety precautions before entering in the laboratory to avoid any mis-happening.
Here are some precautions, which one should take before entering lab:
- Before entering the laboratory one must wear all the safety equipment including gloves, goggles, apron, and others.
- Make sure you are not wearing any inflammable thing and you are fully covered, as in some laboratory, harmful radiation are also present.
- Make sure your hair are tied in properly and the shoes are covered.
If the egg is fertilized during ovulation, the fusion of the sperm and the egg forms a pronuclei then into a zygote (wherein the nuclei is already one or fused completely). It will then undergo the cleavage stage wherein the egg becomes a 2-celled to a 4-celled and to an 8-celled egg. Next is the morula stage as the cells grow larger in number. After that, the embryo starts to rise - the blastocyst stage. Last is the implanted blastocyst stage; the egg is now attached to the uterine lining.