d. jointing
Explanation:
The surface area of rocks exposed to weathering is increased by jointing.
Jointing in rocks increases their surface area.
- Surface area is the outer part of something.
- Mechanical weathering or physical weathering is highly renowned agent for increasing the surface area of rocks.
- When rocks fracture they creates cracks called joints.
- Joints increases the amount of surface exposed.
- Chemical weathering goes faster in surfaces with increased surface area.
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The options are incomplete and have been listed incorrectly. Complete question has been attached.
Answer:
C) Dd and Dd
Explanation:
It is given that deafness is a recessive trait which means that Dr. Smith has genotype dd since a recessive trait can only be expressed when both the alleles in genotype are recessive. However, his parents are normal. So his parents can have DD or Dd genotype. Dr. Smith has obtained one recessive d allele from his father and other recessive d allele from his mother. Thus, the parents should have Dd genotype and the correct option is c.
The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory. Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.