Match these items. 1. an atom that has gained or lost electrons 2. produces oh - ions when added to water 3.produces h+ ions when added to water acid base ion

Answer:

1.    An atom that has gained or lost electrons    - Ion

2.    Produces OH - ions when added to water  - base

 3. Produces H+ ions when added to water - acid

Explanation:

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands