Which of the following could form an ionic compound? Check all that apply.
Na+ and F-
Ca2+ and Fe3+
Cl- and K+
02- and S2-

An organism has the following traits multicellular cant photosynthesize has a skull. wht kingdom does this organism most likely belong too?

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?