Answer: D. Seminiferous tubules → Epididymis → Vas deferens → Ejaculatory duct → Urethra
Explanation:
In humans<u> sperms are produced</u> in the seminiferous tubules of the testis; and stored momentarily in the epididymis . They swim through the (paired )Vas deferens to the single ejaculatory duct, to exist through the urethra that runs the penis length. The urethra is also the passage for urine.
<h3><u>Answer;</u></h3>
Opposable thumb
<h3><u>Explanation;</u></h3>
- An opposable thumb is a thumb that can be placed opposite the fingers of the same hand. Opposable thumbs allow the digits to grasp and handle objects and are characteristic of primates.
- Opposable thumbs are one of the distinguishing features of primates. Opposable thumbs of human beings allow them to use tools.
Answer:
law of superposition
Explanation:
The law of superposition in geology suggests that the sediments are spreading out in a horizontal manner, flat, in all directions, until there's some natural feature that will stop them. It also suggests that the sediments are arranged vertically from the oldest being at the bottom, and the youngest layers being on the top.
Even though this is not always the case in nature, still there are lot of examples that support the law of superposition. When the sediments are aligned in that manner, the geologists find it very helpful and easy to determine the relative age of the layers, as well as the relative age of the fossils that are found in them.
Answer:
1. Myelin sheath
2. Nodes of Ranvier
3. Speed up
Explanation:
A neuron is the fundamental unit of the nervous system and structured into the dendrites, the axons and the cell body.
1. The axons of the neuron are covered by a layer composed of the fatty acids and the proteins that is the constituents of the plasma membrane. This layer is known as the myelin sheath. The myelin sheath provides insulation and increases the speed of transmission.
2. Nodes of Ranvier: The myelin sheath around axons does not form continuous but have discontinuous structures due to the gaps in the sheath. These gaps are known as the Nodes of Ranvier.
3. The nodes of Ranvier increase the speed of the electrical impulse transmission through the neuron.
