The correct answer is d. Robertsonian translocation.
The translocation can be defined as the chromosomal rearrangement, which takes place between two non homologus chromosomes. In the Robertsonian translocation a fragment of the chromosome is replaced with the fragment of another chromosome. In this way, the Robertsonian translocation result in structural abnormality in two chromosomes.
Answer:
The answer is A. Porifera
Explanation:
Those asymmetrical animals have sac-like bodies that lack tissues, and are usually interpreted as representing the cellular level of evolution
Unconformity
Explanation:
The gap between the lower and upper limestone layer can be explained by the occurrence of an unconformity.
An unconformity is a break in stratigraphic record usually marked a prolong period of non-deposition or erosion.
A major break of several millions of years is called a hiatus. A minor break is a diastem.
- During a period of non-deposition, no materials are brought into the basin.
- This can last for several years until deposition resumes again.
- Such a prolonged period of non-deposition causes a break in stratigraphic record.
- At other times, stratigraphic records can be lost to erosion.
- Erosion entails the washing away of the earth.
- This will ultimately cause the loss of records between two strata till deposition resumes.
- In most strata, periods of non-deposition and erosion usually takes place hand in hand.
learn more:
Wind erosion brainly.com/question/2115729
#learnwithBrainly