Over 90% of all atoms in the universe are a) hydrogen b) oxygen c) carbon d) nitrogen

The right answer is Hydrogen.

Hydrogen is the most abundant element in the Universe: 75% by mass and 92% by number of atoms. On Earth, if it represents only 0.22% of the atoms, it constitutes 63% of the atoms of the human body.

It is present in large quantities in stars and gaseous planets; it is also the main component of nebulae and interstellar gas.

It is the first element of the periodic table (it bears the number 1, indicated at the bottom left of the symbol H), hydrogen is the simplest chemical element since it consists only of a proton and an electron.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.