Because all organisms are made up of cells and there are different types of cells which carry different functions.
The answer is true because, the earth was a supercontinent named Pangea, which in turn the ocean was super big then and this was 250 million years ago. You are very welcome.
Answer:
1. Meiosis I
2. Tetrad
3. Tetrad
Explanation:
Crossing over refers to an event taking place in the cells undergoing meiosis cell division during which the exchange of material takes place. The process of crossing over takes place during pachytene of prophase I in meiosis I.
Crossing over takes place when the structure formed by the pairing of the four chromatids of the chromosomes called tetrad is formed. The formation of tetrad allows the exchange of genetic sequences, therefore, result in recombination.
The process of crossing over does not take place in the mitosis as the tetrad is not formed in the mitosis.
Thus, Meiosis I, Tetrad and tetrad are correct.
Viruses are smaller then Bacteria, Viruses require living hosts.
Infections caused by bacteria include:
Strep throat
Tuberculosis
Urinary tract infections
