Question

1. what are common features of animals?

all animals are haploid, heterotrophic, multicellular, have no cell wall, and reproduce sexually.
all animals are diploid, heterotrophic, multicellular, have no cell wall, and reproduce sexually.
all animals are diploid, heterotrophic, multicellular, have cell walls, and reproduce sexually.
all animals are diploid, autotrophic, multicellular, have no cell wall, and reproduce sexually.

Explanation:

1. Animals are diploid (most have two sets of chromosomes in somatic cells; haploid only applies to gametes, not the whole organism).
2. Animals are heterotrophic (they cannot produce their own food and must consume other organisms).
3. Animals are multicellular (made of multiple specialized cells).
4. Animal cells lack cell walls (cell walls are found in plants, fungi, and bacteria, not animals).
5. Sexual reproduction is a common, defining reproductive strategy for most animals (though some can reproduce asexually, sexual reproduction is the standard shared trait referenced here).

Eliminating incorrect options:

• Option 1 is wrong (animals are not haploid).
• Option 3 is wrong (animal cells have no cell walls).
• Option 4 is wrong (animals are not autotrophic).

Answer:

All animals are diploid, heterotrophic, multicellular, have no cell wall, and reproduce sexually.