A particular sequence of parent DNA has four purine bases and two pyrimidine bases. According to base-
pairing rules, which of the following sequences could be formed during replication?

A) two cytosine, two adenine, two thymine

B) two cytosine, two adenine, two uracil

C) two adenine, two thy mine, one guanine, one cytosine

D) two adenine, two guanine, two cytosine

answer; ///i believe that the correct answer is (d); ///

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]