Answer:

1. The Invertebrates unit explores six groups of invertebrates— poriferans (sponges), cnidarians (such as sea jellies and corals), echinoderms (such as sea urchins and sea stars), mollusks (such as octopuses, snails, and clams), annelids (worms), and arthropods (such as insects, spiders, and lobsters).

2. water

3. 1. All animals are multicellular organisms. Their body is made up of more than one cell.

2. Animals are eukaryotic organisms. This means that they have well-defined nucleus ( which contains the genetic material) and membrane-bound subcellular organelles.

3. All animals are heterotrophic in nature. This means that they can not synthesize their own food. They ingest organic substances, which are mainly plant or animal products.

4. Animals produce more number through the sexual mode of reproduction. This means that two parents are involved in the reproduction process.

4. Invertebrates are animals that have no backbone or skeleton inside them. The young invertebrates change shape as they grow up in a process called metamorphosis.

5. Budding. Budding is a form of asexual reproduction that results from the outgrowth of a part of a cell or body region leading to a separation from the original organism into two individuals. Budding occurs commonly in some invertebrate animals such as corals and hydras.

Explanation:

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