Each sieve tube element is normally associated with one or more nucleated companion cells, to which they are connected by plasnodesmata (channels between the cells). Each companion cell is derived from the same mother cell as its associated sieve tube member. Sieve tube members have no cell nucleus, ribosomes, or vacues. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules
I think mutation so D. If not then A
Answer:
The correct option is ALL THE REDWOOD TREES THAT LIVES IN A FOREST.
Explanation:
In the study of the ecosystem, population refers to a group of living organisms that belong to the same species and which live in the same area and interact with one another. In the options given, option A is wrong because a spider and a fly are not the same specie. Option C is wrong because all the plants that live near each other in a forest can not be the same species. Option D is wrong because all the coyotes on earth are not living in the same environment, where they can interact with one another. Option E is wrong because the earthworm that live in a grassland and the one that live in the forest are not living in the same environment and therefore can not interact.
Unicellular organisms are organisms that are made up of one cell only. This is usually the case for bacteria like Ecoli and otherwise known as prokaryotic cell. Multicellular organism are organisms that are made up of more than one cell and there are many such as humans, animals and plants aka eukaryotic cells. There are exceptions such as eukaryotic cells being unicellular such as amoebozoa and excavata. There are also exceptions in which prokaryotic cells can be multicellular such as yeast and amoeba.
