Question

which of the following statements about mammals are true, and which are false?
true
drag appropriate answer(s) here
all mammals possess mammary glands. all mammals are classified as chordates.
humans and kangaroos are mammals. most living mammals are monotremes.
all mammals have a placenta. some mammals are radially symmetrical
organisms.
some mammals lay eggs.
drag appropriate answer(s) here
false

Explanation:

• "All mammals possess mammary glands": Mammary glands are a defining characteristic of mammals.
• "All mammals are classified as chordates": Mammals have a notochord at some stage of development (a key feature of chordates).
• "Humans and kangaroos are mammals": Both have mammalian characteristics like hair and mammary glands.
• "Some mammals lay eggs": Monotremes (e.g., platypus) are egg - laying mammals.
• "All mammals have a placenta": Marsupials (e.g., kangaroos) have a different reproductive structure, and monotremes are egg - laying without a typical placenta.
• "Most living mammals are monotremes": Monotremes are a very small group; most mammals are eutherians (placental mammals) or marsupials.
• "Some mammals are radially symmetrical organisms": Mammals are bilaterally symmetrical.

Answer:

• True: All mammals possess mammary glands, All mammals are classified as chordates, Humans and kangaroos are mammals, Some mammals lay eggs.
• False: All mammals have a placenta, Most living mammals are monotremes, Some mammals are radially symmetrical organisms.