Bioindicators are also known as macroinvertebrates that can give scientists clues about the health of a river or stream that other indicators cannot show. They help determine the health of the river or stream.
Five significant digits. Remember that all non-zero digits are significant, and all zeros in-between significant digits are significant.
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Four - zeros between significant digits are significant.
0.007 has one significant figure. The 7 is significant because all non-zero numbers are always significant. The leading zeroes are not significant.
Only one of them is significant. The leading zero (zero to the left) is not significant. The trailing zero (rightmost) is significant. To recap, only the zero following the seven is significant. See the related links for a really good article on significant digits.
BIOINDICATORS
Daphnia(water fleas) are used as bioindicators in water. If you put daphnia in a river and they die, it means that there is some sort of unnatural chemical in the water that is not supposed to be there.
Bioindicators
The indicator is litmus paper. :)
Lichens are used in various products including natural dyes, perfumes, herbal medicines, and food supplements. They are also commonly used as bioindicators for air quality and pollution levels.
Grasshoppers play a significant role in ecosystems as herbivores, contributing to plant community dynamics and nutrient cycling. They serve as a food source for various predators, including birds, mammals, and reptiles, thus supporting biodiversity. Additionally, some grasshopper species can impact agriculture by damaging crops, leading to economic losses, while others are used in research and as bioindicators of environmental health. Their role in the food chain underscores their importance in maintaining ecological balance.
Damselflies are important because they help control insect populations by preying on smaller insects. They also serve as a food source for other animals in the ecosystem. Additionally, their presence can indicate good water quality, making them bioindicators for environmental health.
Xanthoria is a genus of lichen that is bright yellow to orange in color. It is commonly found on rocks, tree bark, and soil in a variety of habitats, from forests to urban areas. Xanthoria lichens are known for their tolerance to pollution and are used as bioindicators of air quality.
Paramecium aurelia can be harmful as it competes with other organisms for resources in aquatic ecosystems, potentially affecting biodiversity. However, they can also be useful as bioindicators for water quality, helping to assess environmental health and pollutant levels.
Woodlice, belonging to the order Isopoda, play significant roles in ecosystems as decomposers, breaking down organic matter such as dead plant material and recycling nutrients back into the soil. They contribute to soil aeration and structure, enhancing soil quality and promoting plant growth. Additionally, woodlice serve as a food source for various predators, thus supporting biodiversity. Their presence can also indicate soil health and environmental conditions, making them valuable bioindicators.
significant
Three. All nonzero digits are significant and zeros in between significant digits are always significant.