Answer:
The correct answers are "embryo, gap junctions, heterotrophic, motile, muscles, neurons and lack of cell walls".
Explanation:
In order to select which characteristics can help to distinguish an animal from a plant it is important to know which characteristics are unique for animals. These characteristics include:
- Embryo. Plants do not reproduce as animals where an organism gets pregnant and develops an embryo. Plants reproduce by diverse sexual and asexual approaches, where embryos are only produced inside a seed.
- Gap junctions. These structures are only present within intercellular connections in animal cells. Plant cells have other structure called plasmodesmata that perform this process.
- Heterotrophic. Animals cannot produce their own energy, therefore they are heterotrophs that feed from other organisms. On the other hand, plants are autotrophs.
- Motile. Most animals are motile, while only a few plants have limited motility and it only occurs in the presence of a stimuli like the presence of a prey or sunlight.
- Muscles. Plants do not have muscles, they have other structures to allow a limited movement and growth.
- Neurons. Plants do not have a nerve system based on the presence of neurons.
- Lack of cell walls. Plants have cell walls to provide rigidity to their structures. Animal cells do not have these structures.
