You are presented with the question "Biomes that have suffered mainly from pollution have water that contains little or no what?" and the following answer choices:  - Toxins  - CO 2  - liquid  - salt  - Lead  - Carbon  - Acids  - sulfur  Now knowing that freshwater biomes have water that contains little or no salt and freshwater biomes have suffered mainly from pollution, choose the best answer.
salt


You are presented with the question "what contributes to soils?" and the following answer choices:  - roundworms  - humans  - rainfall  - cacti  - bacteria  - weathering  - viruses  - Most plants  Now knowing that roundworms make up the phylum Nematoda and also, nematoda and rotifera are important groups contributing to soils, choose the best answer.
roundworms


Q: You are presented with the question "what is regulated by breathing?" and the following answer choices:  - thirst  - air pressure  - blood flow  - body water  - Energy  - Chemical energy  - Decibels  - kinetic energy  Now knowing that blood pH may become unbalanced if the rate of breathing is too fast or too slow and breathing is regulated to keep as normal as possible arterial blood pH and PO2, choose the best answer.
A: blood flow


Question: You are presented with the question "What creates the sweet flavor in cookies?" and the following answer choices:  - cinnamon  - Glucose  - bees  - bananas  - Cooking  - sugar  - grapes  - heat  Now knowing that sugar causes food to taste sweet and cakes and cookies taste sweet because a little extra sugar is added for flavoring, choose the best answer.
Answer: sugar


*Question*
You are presented with the question "What happens to your leg when muscle fibers shorten?" and the following answer choices:  - they bend  - It decreases  - It straightens  - permineralization  - It expands  - Damages them  - Localized damage  - Dehydration  Now knowing that muscle contraction occurs when muscle fibers get shorter and contraction of the muscle straightens the leg, choose the best answer.
**Answer**
It straightens


Q: You are presented with the question "What causes weathering?" and the following answer choices:  - swea  - Winter  - wind  - rivers  - CO 2  - sand  - peat  - ice  Now knowing that wind causes erosion and water erosion has similar consequences as wind erosion, choose the best answer.

A: wind