High School

8. Give an example of a multicellular organism and an example of a unicellular organism.

9. Multicellular organisms can be organized into what other levels?

10. Circle which of the following would be made of cells. Place a box around the ones which only show cell walls.
- Cork
- Sponge
- Wood
- Plastic
- Tree

11. Examine these two organisms. Which one is unicellular and which is multicellular? (Label each.)
- Pond Organism (under a microscope)
- Crab

12. Define reproduction.

13. Must every member of a particular species (one kind of organism) be able to reproduce in order for the species to survive? Explain why or why not.

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**Reproduction**

Perhaps the most obvious of all the characteristics of life is reproduction, the production of offspring. Organisms don't live forever. For life to continue, organisms must replace themselves. Reproduction is not essential for the survival of an individual organism. However, it is essential for the continuation of an organism's species. A species is a group of similar-looking organisms that can interbreed and produce fertile offspring. If individuals in a species never reproduced, it would mean an end to that species' existence on Earth.

Answer :

Final answer:

This response provides examples of unicellular and multicellular organisms, explains the levels of organization in multicellular organisms, and discusses reproduction and its significance for species survival. It differentiates between various substances based on their cellular composition. The answer also includes a definition of reproduction and its relevance to a species' continuation.


Explanation:

Examples of Unicellular and Multicellular Organisms

An example of a unicellular organism is bacteria, which consist of a single cell and can perform all necessary life processes independently. An example of a multicellular organism is a human, which is composed of many cells organized into specialized tissues and organs.

Levels of Organization in Multicellular Organisms

Multicellular organisms can be organized into several levels, including:

  1. Tissues: Groups of similar cells working together.
  2. Organs: Structures composed of different tissues performing specific functions.
  3. Organ Systems: Groups of organs that work together to perform complex functions.

Identifying Cell Structures

When examining which items are made of cells:

  • Cork
  • Sponge
  • Wood
  • Plastic
  • Trees

Cork, sponge, and wood are examples of materials made from cells, while plastic is not. Circling the items shows which are made of cells, while boxing items shows those that primarily consist of cell walls.

Organisms Classification

In your examination, labeling Pond Organism as unicellular and Crab as multicellular aligns with their classifications.

Reproduction Defined

Reproduction is defined as the biological process through which organisms produce offspring, ensuring the continuation of their species.

Species Survival and Reproduction

Not every member of a species must be able to reproduce for the species to survive because the possibility exists where certain individuals may not reproduce but can still contribute to the gene pool. For example, even if some individuals within a species do not reproduce, as long as others do and they successfully produce fertile offspring, the overall species can continue to exist.


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