The illustration is missing the type of organisms known as decomposers. They break down dead animals and plants and have the vital role in returning the nutrients back into the system, where they can be used once more by the primary producers.
In the illustration:
The primary producers are the phytoplankton.
The primary consumers are the: krill, cod and zooplankton
The secondary consumers are the remaining species that feed on the primary consumers.
Answer:
The statement is true.
Explanation:
The DNA structure had been studied for years, and there were even some theories, like the three-stranded DNA structure. Nevertheless, until Watson and Crick started to develop the actual structure of the DNA, with the help of Rosalind Franklin's pictures, there wasn't a strong theory that could explain some of the DNA properties.
Answer:
Birds do not have a diaphragm; instead, air is moved in and out of the respiratory system through pressure changes in the air sacs. ... Bird lungs do not expand or contract like the lungs of mammals. In mammalian lungs, the exchange of oxygen and carbon dioxide occurs in microscopic sacs in the lungs, called 'alveoli.
Explanation:
