The best answer is C.
Chloroplasts are not found in all eukaryotic cells but only in plant cells. Animal cells are eukaryotic in nature but animals do not have chloroplasts in their cells because they do not engage in photosynthesis.
Photosynthesis is the process by which plants make their own food. Chloroplasts contain chlorophyll which is essential in t trapping sunlight from which supplies the energy for photosynthesis.
Animals do not make their own food like plants but eat ready made food so their cells lack mechanisms for food manufacture.
Answer:
B
Explanation:
I personal will go with B cause viruses attack your immune system then destroy healthy cells then copy it self through out the rest of the body.
C. Observations are made in a living mouse
An in vivo experiment consists on conducting the study in a whole living organism, in this case, a mouse
The corridors are a proposed solution to enhance the species survival by effectively creating a large preserve from several smaller ones. The different patches of the forest lands are separated by the human activities, turning them into agricultural land, highways, or housing communities. This affects the migrating behaviors of the animals living in these forests patches. By connecting these separated patches by building corridors will solve this problem, and help conserve the species.
Hence, the answer is 'corridor'.