An element in a group iia would form a ion while an element in group viia would form a(n)

positive, negative

Explanation:

The elements of group IIA in the periodic table are called Alacaline Earth Metals. This family is composed of the following metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra). The radio element has a very short average lifetime.

These elements are ions of possible charge, for this reason they are called cations and need to lose electrons to maintain their stability in the valence layer.

The elements of the VIIA group are called halogens. This group is formed by the following chemical elements: fluorine, chlorine, bromine, iodine, astatine or Astatinium and Ununseptium. Together with Noble Gases (group 18 or 8A), the Halogen family are the only families that have only Nonmetals.

Halogens are negative ions, so they are classified as anions and receive electrons to maintain stability in their valence layers.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.