I’m getting worried why does my dog twitch a bit in her sleep?

Construct an explanation about the function of mitosis for multicellular organisms

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2