Answer:
cyanobacteria
Explanation:
the answer of this question the 3rd one, because if you were to think and look up the oldest Bactria it would be that answer.
when excess fertilizers wash off of the nearby farms and into the lake, they become food for the algal blooms that can plague the lake in the summer. So, reducing fertilizer use and preventing runoff directly into the lake would be one way of reducing eutrophication.
Virus is the only organism which has only one strand
Answer: All the above options are correct about the characteristics of Lumbriculus variegatus.
Explanation:
Lumbriculus variegatus also called the black worm belongs to the phylum Annelida and is used by biologists to illustrate:
-blood vessel pulsations,
-swimming reflex,
-peristaltic crawling behavior,
-giant nerve fiber action potentials.
These studies where carried out on them due to the characteristics they possess. These includes:
-its blood circulates in a closed circulatory system
-Freshwater worm found throughout North America and Europe
-Prefers the shallow habitats found at the edges of ponds, lakes, or marshes
-Feeds on decaying vegetation and microorganisms.
