c The fall line is where rivers are no longer navigable by ships traveling in from the ocean, so goods had to be offloaded.
Explanation:
Cities tended to develop at the fall line of rivers simply because rivers are no longer navigable by ships travelling from the ocean and goods have to be offloaded.
- The fall line provides a natural demarcation where a coastal plain meets the upland area.
- From this area, a river enters into the ocean.
- Ships are built to navigate the ocean. Their design makes it impossible for them to coast through rivers which are smaller water bodies.
- This prompts ships coming to offload around the region where the coastal plain meets the upland area the river is coming from.
- Harbors and docks are usually built in such areas.
- They are hubs of trade and commerce attracting a large population of people.
- Therefore, cities invariably emerge.
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15. Cytoskeleton
16. Cilia
17. Golgi Apparatus
18. Smooth
19. Lysosome
20. Eukaryotes
21. Flagellum
Answer:
a. eukaryotes
b. unicellular
c. autotrophs; heterotrophs
Explanation:
Protists represent a separate kingdom of eukaryotic organisms (ie., organisms whose cells have a nucleus). The most important features of protists include: 1- they are unicellular organisms, 2-contain mitochondria, 3-can be parasites, and 4-generally live in optimal conditions in moist or aquatic environments. In the past, protists were divided into Protozoa (animal-like organisms) and Protophyta (plant-like organisms), which nowadays we know are heterotrophic (also often parasitic) and photosynthetic protists, respectively.
