Which of the following is an example of a species changing over time. choose all answers that are correct. a. a gardener notices a new kind of squash growing after he only planted seeds from his previous squash plants. b. a rabbit's ears are bigger than a mouse's ears. c. some weeds have become resistant to a chemical designed to kill them. d. the purple- spotted butterflies in your collection have more spots than the purple-spotted butterflies your grandfather collected when he was a child. e. a giraffe's neck is longer than a deer's neck.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

confused

confused             hewdejdnjnjsnd

catya that's not even a b or c