Answer:
abiotic
Explanation:
Fire is not a living thing, and abiotic factors are the factors in an ecosystem that are not-living. Therefore, fire is an abiotic factor in an ecosystem, though is rarely mentioned.
I can help with the first one and third for you.
Symbol | atomic # | Mass of # | # of Protons | # of electrons | # of neutrons
Na | 11 | 23 (when rounded) | 11 | 11 | 12
Sr | 38 | 88 (when rounded) | 38 | 38 | 50
(sorry if this didn't help)
Euthrophication is caused by excess nutrient run off, such as nitrogen or phosphorus. A common chemical that generally cause euthrophication is fertilizers from farm, if there's heavy rainfall or floods, they're easily washed into the rivers and lakes to cause euthrophication.
Euthrophication generally cause a sudden large scale algao bloom, or other plants, and they may cover the whole surface of water. Once these plants die, decomposers such as bacteria decompose them and take in oxygen for respiration, such that animals from the river originally may die due to lack of oxygen.
Prophase 1 of meiosis <span>relative to the number of chromosomes of a given species, accounts for a significant amount of genetic variation in gametes.</span>
