Veins take blood back to the heart. Which gas would be most abundant in a vein that takes blood from muscle cells in the arm back to the heart? A carbon dioxide B oxygen C nitrogen D hydrogen

Which substance is a nucleic acid? A. amino acid B. fat C. polysaccharide D. RNA

Which statement best describes why a chemical change is different from a physical change? A chemical change results in a different state of matter, and a physical change results in a new substance being formed.

Many living organisms respond to things in their environment is called

Which stage of a butterfly's life cycle occurs directly before a chrysalis forms? a. larva b. egg c. pupa d. adult

Which substance ha the most thermal energy and will have the most heat flow from it A. A stovetop burner on medium at 200%C B. A nuclear reaction core 1000%C C. The human body 36%C D. Air at room temperature 32%C

Why are bacteria needed in the nitrogen cycle? A) Other living things cannot use atmospheric nitrogen. B) Other living things cannot use the nitrogen in plants. C) Bacteria are the main nitrogen reservoir.

Ant lions are small insects that dig funnel-shaped depressions in sandy areas. They hide in the dirt at the bottom of the funnel.

What is the procedure/variables for the plate tectonics lab

A gene has the base sequence that starts with TCG GAC CAT CGA. What would be the complementary DNA strand formed from this DNA?

Is Exothermic/Endothermic related to Product/Reactant Favored?