Which statement is true?

metals have 5 to 8 electrons in their outermost shell and will easily give them up.

metals have 1 to 3 electrons in their outermost shell and will easily give them up.

metals don't have electrons.

metals have 1 to 3 electrons in their outermost shell and will seek more electrons rather than give any up.

Option (b) is the correct answer.

Explanation:

It is known that metals are rich in electrons and in order to gain stability they readily lose electrons so  that their octet becomes complete.

For example, sodium is a metal and its atomic number is 11. It readily loses one electron to gain stability.

Also, it is easy for metals to lose 1 to 3 electrons from their outermost shell.

Thus, we can conclude that metals have 1 to 3 electrons in their outermost shell and will easily give them up.

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.  

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )