In most triploblasts after embryonic development the three layers are represented as___________?
Correct answer: B. Structures formed from them
- A. Separate layers of cells
- B. Structures formed from them
- C. Structures associated with them
- D. Their functions in body
Explanation
During development, ectoderm, mesoderm and endoderm do not usually remain as simple separate sheets; they differentiate into organs and tissues such as skin, muscles, bones and the gut. Students may choose a because the germ layers begin as separate cell layers, but that describes their embryonic arrangement rather than their adult representation.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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