The most primitive true animal belongs to the phylum ____
a. Porifera
b. Cnidaria
c. Annelida
d. Mollusca
e. Platyhelminthes
a
You might also like to view...
An object following a straight-line path at constant speed
A) has a net force acting upon it in the direction of motion. B) has zero acceleration. C) must be moving in a vacuum or in the absence of air drag. D) has no forces acting on it. E) none of the above
Many present-day fisheries managers ________
A) favor short-term solutions to marine ecosystem problems B) favor taxes on commercial fishing boats C) wish to set aside areas of ocean where systems can function without human interference D) want all laws regarding fishing to be abolished E) favor protection of commercially valuable species and not others
If a downdraft is too ____, it may inhibit the lifting needed for tornado formation
a. cold and strong b. cold and weak c. warm and strong d. warm and weak e. humid and weak
Ecological systems often undergo periodic disturbances
A. only in arid environments. B. such as floods and fires. C. and show resilience when they recover quickly. D. such as floods, fires, and show resilience when they recover quickly.