Answer:
The pericardium is the most outer layer of the heart. Main function to protect the heart from external forces/entry.
Hi there!
A prezygotic isolating mechanism is a mechanism that causes something to happen, not allowing the organisms to breed before fertilization. I'll explain each one for you.
A - That is postzygotic because the organisms were not stopped before fertilization. The result is a sterile organism.
B - Again, that is postzygotic because the organism was produced.
C - This is prezygotic! The sperm dying shows that something is in action to prevent fertilization, meaning that it cannot happen.
D - Fertilization was successful, so it is postzygotic.
ANSWER:
C - the sperm dies when it reaches the female tract
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The cells show characteristics of tumors.
Tumor cells have the ability to grow and proliferate in absence of adhesion or anchoring. This is particularly helpful during metastasis when a cancer cell travels through the bloodstream to another location.
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A cancerous cell has a number of mutations that regulate cell division. In addition, they exhibit impairment in DNA repair system. Therefore, cancer cell divided fast. Since the DNA repair system is nonfictional, the cells do not pause division to repair the mutation.</span>
1.) [Bacteria] are single-celled organisms with no nucleus.
2.) The kingdom [Archaebacteria] is relatively small.
3.) Eubacteria are classified by [shape].
4.) [coccus] are round bacterial cells.
5.) [bacilli] are rod-shaped bacterial cells.
6.) [spirilli] are spiral-shaped bacterial cells.
