1) Why are viruses not generally considered to be living things? 2) State one similarity and one difference between the cells of a fungus and the cells of a plant.

3) How do the cells of bacteria differ from the cells of plants and animals?​

4) List three ways in which all mammals differ from all birds.

5) Explain why bats are classified as mammals, even though they have wings.

1) Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.

2) Fungal cells are similar to plant and animal cells in that they have a nucleus, cell membrane, cytoplasm and mitochondria. Like plant cells, fungal cells have a cell wall but they aren't made of cellulose, they're made of chitin instead.

3) Because bacteria are prokaryotic, they do not have a nucleus and no membrane-bound organelles. In contrast, plants and animals are made up of eukaryotic cells, which means they have a nucleus and membrane-bound organelles like mitochondria or golgi apparatus.

4) Mammals give birth to their young whereas birds lay eggs.

Birds have feathers whereas mammals have only fur or hair.

Birds have porous or hollow bones. ...

Birds have wings while mammals have paws, hands, and hooves.

Mammals produce sound using a larynx, but in birds this organ does not produce sounds.

5) Bats are true mammals in that they give birth to live young, produce milk to feed their young, have hair, and they are warm-blooded (they can self-regulate their body temperature). Bats are unique among mammals in that they can fly. ... They belong to the scientific order of Chiroptera, meaning “hand wing”.

Explanation:

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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