When one microbe's metabolic activities create favorable conditions for another microorganism, this is referred to as (competition/cooperation/facilitation).
Fill in the blank(s) with the appropriate word(s).
cooperation
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Certain plants have been genetically modified to secrete citrate, which helps
A. make the phosphate in soils more soluble. B. plants make necessary micronutrients. C. reveal mineral deficiencies in a plant. D. make hydroponic growth possible. E. plants add metals to the soil in which they are growing.
Imagine that you are studying a new species. As you examine the circulatory system, you note that the diameter of the vessels grows smaller and smaller as you move farther from the heart, but the blood is always contained within vessels. If you want to place this new species into a group whose membership is solely based on whether the animals included share this described type of circulatory system, which animals would be included in this group? Check all that apply.
A. fish B. housefly C. frogs D. all mollusks
The two interesting types of people who led researchers to discovery of the SRY gene were
A) physicists and chemists. B) XX males and XY females. C) XY males and XX females. D) XXX females and XYY males.
Answer the following statements true (T) or false (F)
1. What evolutionary advantage do flowers provide to angiosperms? 2. The common garden snail lacks a vertebrae and is a member of the mollusk phylum, therefore it is a deuterostome. 3. This statement is false. Nematodes have a complete digestive system, but tapeworms absorb nutrients from their host’s digestive system. 4. Hexapods have six legs, while the Chelicerates have eight. 5. The subclass Hirudinoidea, which includes leeches, have chaetae that allow them to attach to a host vertebrate for feeding.