1. a flexible, supporting structure found only in chordates is the
a. nerve net
b. notochord
c. pharyngeal slits
d. dorsal fin.

2. ancient chordates are thought to be most closely related to which of the following species?
a. spiders
b. earthworms
c. octopi
d. sea stars

What does the positioning of transcription factors determine?

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.