<span>Chromosomal and genetic causes:
Muscular dystrophy, sickle cell anemia, hemophilia, cystic fibrosis
CHARGE Association (syndrome) and Usher syndrome are the two examples of genetic causes of deaf-blindness
-Teratogenic causes:
TORCH - toxoplasmosis, other, rubella, cytomegalovirus, and herpes.
-Prematurity and pregnancy complications:
Neurological conditions, cerebral palsy -(tongue and mouth cant move to articulate), vision or hearing loss, intellectual disability
-Acquired causes:
Traumatic brain injury (TBI), child abuse, environmental toxins</span><span>Topographical </span>
The frequency of allele T would decrease and the frequency of allele t would increase.
When particles spread out it is called diffusion.
<span>The vertebrate nerve code is found dorsally while that of the crayfish is located ventrally of its body. Additionally, the ventral nerve cord of the crayfish is a solid ventral tube while that of the vertebrate is a hollow tube. All vertebrates are chordates, the dorsal nerve cord develops into nervous tissue of the brain and spinal cord; unlike the notochord which is the scaffolding for development of the bone and cartilage of the vertebral column. In the crayfish, they have a ventral nerve cord which is a collection of nerves found in the abdomen.</span>
This diagram seems to begin with Multicellularity. So, as you follow the line, the next is tissues, then three-germ layers, bilateral symmetry
So, right before 3 germ layers is tissues
So, the answer is D
