Recent fossil evidence shows a placoderm with a developing embryo inside her body. How might we have been able to speculate that placoderms were viviparous in the absence of such evidence?

What will be an ideal response?


Placoderms have pelvic claspers in the (presumed) males, which were probably used for internal fertilization, as in viviparous chondrichthyans.

Anatomy & Physiology

You might also like to view...

When a rainstorm erupts outside Rita's Souvenir & Gift Shop, Rita and Shaw enter into an implied contract to split the revenue from Shaw's sale of umbrellas to Rita's customers. The terms of this contract are defined by

a. the conduct of the parties. b. the words of the parties. c. the unforeseeable storm that gave rise to the deal. d. the unexpressed subjective intent of the parties.

Anatomy & Physiology

The ____________________ is the largest artery in the body.?

Fill in the blank(s) with correct word

Anatomy & Physiology

Choosing from the lateral neck muscles, which muscle is the prime mover for flexion of the head at the neck?

A. pectoralis major B. sternocleidomastoid C. splenius capitis D. trapezius E. thyrohyoid F. anterior scalene

Anatomy & Physiology

If someone were to have abnormally low levels of protein in their blood, then net filtration pressure would

A.  be higher than normal. B.  be lower than normal.

Anatomy & Physiology