I believe the answer for your question is a mitochondria.
Answer:
9.378*10^8
Explanation:
The number of phages in each cycle 
The number of host infected in each cycle 
The number of phages released by each hosts in each turn 
There are total
cycle .
So the total number of phages that exist in a single plaque if 3 more lytic cycles occur

Answer:
History of exercise and health.
Explanation:
The exercise is important for all the individual as it keeps the individual fit and healthy. The different exercise are performed by the different individuals based on their age, sex and strength.
The research related to the physical health and physical activity was started in 1980's. These researches explains the importance of the exercise and the positive relationship between the health and the exercise. The health benefits of the yogas and asanas are started during this time.
Thus, the answer is history of exercise and health.
Answer-E,A,H,C, G, D,F,B
Explanation 1. Community- The interacting populations within a geographic area
2. Biocide-a. A substance that is capable of destroying living organisms
3.Habitat- h. The environmental situation in which an organism is generally found
4. Biosphere- The portion of the earth's surface, water, and air that can support life
5. Ecosystem- g. A system formed by the interactions of communities of organisms with each other and the environment
6.Cell- d. The simplest structure that exhibits all of the characteristics of life
7. Ecological niche- f. The role or position that a species occupies in a community
8.Biome- b. All the communities and ecosystems found under a given set of climatic conditions
Answer:
They have no maintenance costs
Explanation:
Some flood mitigation measures have absolutely no maintenance costs. One significant one is the enactment of a policy that revokes any kind of settlement or human activities in flood zone areas. Flood zone areas are regions where water drains naturally hence providing proper natural drainage. Keeping these regions unobstructed will definitely mitigate flood damage to built environments because they'll be less likely to get flooded.