Question

1. what are common features of animals?

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.
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.

Explanation:

To determine the correct option, we analyze each characteristic:

• Ploidy: Animals are typically diploid (have two sets of chromosomes), so "haploid" is incorrect, eliminating the third option.
• Nutrition: Animals are heterotrophic (obtain food from other sources), not autotrophic (make their own food), so the second option is out.
• Cell Wall: Animal cells lack cell walls (plant cells have them), so the first option (which says animals have cell walls) is wrong.
• The fourth option has all correct characteristics: diploid, heterotrophic, multicellular, no cell wall, and sexual reproduction (most animals reproduce sexually, though some can asexually too, but this is the best fit among the options).

Answer:

D. All animals are diploid, heterotrophic, multicellular, have no cell wall, and reproduce sexually. (Note: Assuming the last option is labeled D; if the options are labeled differently, adjust the identifier, e.g., if the last option is A, B, C, D as per standard, the correct one is the fourth option with the text "All animals are diploid, heterotrophic, multicellular, have no cell wall, and reproduce sexually.")