*Question*
If excretion removes waste from blood, then what removes waste from blood? Answer choices: - exhaling - Leptospirosis - hemmhorage - Acids - excretion - glucose - bacteria - respiration
**Answer**
excretion

*Question*
If acatalyst can lower the energy cost of a chemical reaction, then in what way does a catalyst help in chemical reactions? Answer choices: - Generating heat - lowered energy cost - metabolic reaction - heating liquids - by making heat - adding heat - increases a body's strength - preventing heat transfer
**Answer**
lowered energy cost

*Question*
If cells are formed into tissues and tissues form the liver, then the liver is formed after cells for into? Answer choices: - death - humans - Energy. - tissue - migrate - grow - recovery - expelled
**Answer**
tissue

*Question*
If pollen consists of tiny grains that are held by flowers, then pollen consists of tiny grains that are held within what? Answer choices: - bees - fruits - vegetation - flowers - lmestone - an object - loose dirt - leaves
**Answer**
flowers