CLASSIFICATION Compare the following characteristics of invertebrates and vertebrates. Overall complexity General structure Presence of a backbone Where they live (in water or on land) Simple/not complex More complex O More complex body plan, have more complex organ systems O Simple body plan, might have a skeleton, simple circulatory or digestive systems O Live in water or on land O Have a backbone No backbone
Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30ยฐ below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n
What effects result when there is an impact between earth and an asteroid? check all that apply. a. massive flooding. b. extinction of many life forms. c.major earthquakes change in average global temperature. d. giant dust cloud