Questions: Which of the following is a true statement about vertebrate reproduction? Birds and mammals provide parental care to the offspring. All vertebrates have internal fertilization. All mammals give birth to fully formed live offpring. No vertebrate undergoes metamorphosis.

The answer is the first one: Birds and mammals provide parental care to the offspring.

Explanation for each option:

1. Birds and mammals provide parental care to the offspring.
   This statement is true. Many bird species and most mammals exhibit parental care, which includes feeding, protecting, and teaching their young. This care is crucial for the survival and development of the offspring.

2. All vertebrates have internal fertilization.
   This statement is false. While many vertebrates, such as mammals and some reptiles, have internal fertilization, others, like most fish and amphibians, often have external fertilization where eggs and sperm are released into the water.

3. All mammals give birth to fully formed live offspring.
   This statement is false. While most mammals are viviparous (giving birth to live young), there are exceptions like monotremes (e.g., the platypus and echidna) that lay eggs.

4. No vertebrate undergoes metamorphosis.
   This statement is false. Many amphibians, such as frogs and salamanders, undergo metamorphosis, transitioning from a larval stage (like a tadpole) to an adult form.

In summary, the true statement about vertebrate reproduction is that birds and mammals provide parental care to their offspring.