What is the maximum timeframe for transporting urine specimens to the lab after collection?

What is an important factor to consider when collecting a urine specimen from a pediatric patient?

Seastars were the very first species that were shown to be a Keystone species.

Hagfish and Lampreys are closely related, jawless, fish.

What was the original function of bone?

Write down the five diagnostic characteristics of the chordates 

The major difference between Placoderms and Acanthodians was  ___________________________

Fishes are a large and heterogeneous group. According to the textbook, there are about [answer1] vertebrate species, of which [answer2] are fish species.  Hint: the answers are numbers. 

Hagfish have a number of odd characteristics including a low pressure circulatory system with four hearts. Write down two other unusual characteristics.

Among many new features found in the early vertebrates, one involved the development in the circulatory system of a ventral chambered [answer1], and cells for transporting oxygen in the blood called [answer2]