An organism has the following features: diploid ife cycle; protostome embryonic development; true coelom; closed circulatory system; segmentation; appendages without joints; no mantle. to which phylum does this organism belong?
a. porifera
b. chordata
c. mollusca
d. annelida
e. arthropoda

Annelida.

Explanation:

The non chordate organisms are classified into 10 different phylum. These organisms are classified into different phylum by looking at the similarities and differences shown by the organism.

The organisms that are involved in the phylum annelids shows the distinguish characteristics of the organisms of other phylum. The organism shows closed circulatory system, body is segmented and no mantle cavity is present. They are true coelomic animal, shows protostomic development in which mouth develops first and anus later. They have appendages that are not jointed with each other.

Thus, the correct answer is option (d).

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'