They could improve the experiment that they made by adding another variable such as: watering the plants with fresh water. This way they could have a better comparison how plants grow based on the type of water they are exposed with.
Answer:
B. A change in the DNA sequence of a gene
Explanation:
Helpful bacteria: Decomposers, Nitrogen fixers, Probiotics
Harmful bacteria: Pathogens, Salmonella, MRSA
Bacteria are microscopic,
single-celled organisms that exist in their millions, in every environment,
both inside and outside other organisms. There are many different types of
bacteria. One way of classifying them is by shape. Some bacteria are helpful
while some are harmful.
Chlorella is a genus of about thirteen species of single-celled green algae belonging to the division Chlorophyta. The cells are spherical in shape, about 2 to 10 μm in diameter, and are without flagella. Their chloroplasts contain the green photosynthetic pigments chlorophyll-a and -b. In ideal conditions cells of Chlorella multiply rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce.
