Question

distinguishable from their ancestors because they all developed amniotic eggs for embryos. mammals are the newest class of phylum chordata. mammals developed the ability to produce milk, which sets them apart from their ancestors. which of the following is a characteristic of all amphibians? claws legs horns

Explanation:

Amphibians (like frogs, salamanders) typically have legs (though some like caecilians are legless, but legs are a more defining trait across most amphibians compared to claws/horns; claws are more reptilian, horns not amphibian trait). So legs is a characteristic of most/all amphibians (excluding exceptions but among options, legs is correct).

Answer:

B. legs