Explain why 2 brothers may look very different if they have the same parents. be sure to write in complete sentences and use the term "crossing over".

Using the periodic table, determine which material is most likely a good conductor

What is the next step in muscle contraction after the actin changes shape

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.