Fill in the blanks The says that atoms need to have valence shells to become stable.

• Most atoms need electrons to fill their valence shells.

• Hydrogen and helium atoms need only electrons to fill

their valence shells.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Me with biology endocrine system crossword also image left i need with hw