The northern copperhead is Agkistrodon contortrix contortrix,the southern copperhead is Agkistrodon contortrix mokasen, and the
cottonmouth is Agkistrodon piscivorous. Therefore, A. all are subspecies of Agkistrodon.
B. they are three distinct species.
C.the copperheads are subspecies and the cottonmouth is a separate species.
D. they are all the same species.
Therefore "the copperheads are subspecies and the cottonmouth is a separate species".
<u>Answer:</u> Option C
<u>Explanation:</u>
The higher classification is "copperhead"for both the subspecies Agkistrodon contortrix contortrix and Agkistrodon contortrix mokasen. As the name itself consist species name "A. contortrix", both are belonging from "Viperidae" family, "Crotalinae" subfamily and venomous pit viper subspecies.
These are generally silent snakes as they show lazy and motionless behavior when encountered but on agitating sufficiently they become protectively aggressive and they are species of eastern North America. While Agkistrodon piscivorous are separate species with higher classification as "Cottonmouth" and name carry species name "A. piscivorus". It is indigenous to southeastern United States and belongs to same family as copperhead.
The best answer would be the first statement. The first sentence which is 'water pollution causes a decrease in fish populations in a river.' illustrates how human <span>activities can most directly change the dynamic equilibrium of an ecosystem.</span>
Rill erosion occurs when runoff water forms small channels as it concentrates down a slope. These rills can be up to 0.3m deep. If they become any deeper than 0.3m they are referred to as gully erosion
Each osteon is made out of concentric rings of a calcified network called lamellae (solitary = lamella)
the lacunae and osteocytes are found in a grid-like system of network spikes called trabeculae (particular = trabecula) (Figure (Links to an outer site.)). The trabeculae may give off an impression of being an irregular system, however every trabecula shapes along lines of worry to give solidarity deep down.
This system of flat bones consist of spongy bone permits supplements to be moved to the osteocytes and squanders to be expelled from them
Hence, the right answer is "flat bones consist of spongy bone sandwiched between compact bone is true statement"
