At each level of the food chain, what happens to about 90% of the energy? A) gained as energy B) lost as heat C) converted into unusable compounds D) excreted as waste

All hematopoietic and immune blood cells are derived from which cells in the bone marrow?

The diagram below represents the stages of reproduction of a common virus. Use the diagram to answer question 3-6.

Where the first stage of celluar respiration ocuur? W X Y Z

What the force that slows down airplanes

What would most surprise an ancient Athenian about government in the United States today?

Which statement represent an abiotic environmental factor in an ecosystem? *The flower bud every spring. *The fish swim up the river to reproduce. *The fox eats meats in the meadow. The lake bottom is lined with rocks,

Which of these has NOT provided evidence showing that the continents have drifted over time? O A) rocks OB) fossils OC) earthquakes OD) geologic structures

All organic molecules contain the element carbon.

Which cell part contains directions for cell growth and reproduction? A. cell wall B. plasma membrane C. nucleus D. pores

Which of the following statements are incorrect? A. Stem vascular bundles in monocots are in a ring. B. Dicot roots are fibrous in structure. C. Pollen in monocots has one opening. D. Dicots have floral parts mostly in multiples of fours and fives.