The best answer to go with is b you’re welcome have a great day
Answer:
A neuron that has only one axon but several dendrites is classified as:
a. multipolar neuron.
Explanation:
- The neurons are the fundamental unit of the nervous system.
- The nervous system consist of only two types of cell; neurons and neuroglia.
- Neurons are specialized to respond to physical and chemical stimuli, conduct nerve impulse and release neurotransmitter , while the neuroglia supports , nourish and protect the neuron.
- Most neurons have three parts: a cell body, dendrites and axon.
- Neurons show a great diversity in size and shape, and are classified on the basis of structure and function.
On the Basis of structure the neurons are classified as: unipolar, bipolar and multipolar. (Multidendritic neurons are studied in <em>Drosophilla </em>and are reported to be a result of misexpressed<em> gene</em>)..
- Multipolar neurons are the most common type of neurons in the brain and spinal cord and have several dendritic processes and one axon.
- Bipolar neurons are found in retina of the eye, in the inner ear and in the olfactory area of the brain and are characterized by one dendrite and one axon.
- Uni-polar neurons have single processes extending from the cell body which divide into two branches.
On the basis of function neurons are classified as; sensory, motor and association neurons.
Answer:
Cynognathus fossils were important to Wegner's theory because they were found on lands now separated by a wide ocean.
Explanation:
Wegner used the fossil of cynognathus as evidence to prove his continental drift hypothesis. Cynognathus are reptiles which lacked the swimming ability. These reptiles survived in the land before separation in live form along with other organisms surviving side by side.
Later due to certain natural phenomenon these reptiles died and the land got separated by a wide ocean. The fossils of cynognathus reptiles are now found in the lands that are separated by wide ocean.
Answer:
Fertility awareness
Explanation:
Fertility awareness involves the woman being observant about different pointers during her menstrual cycle. This method is not the safest.
Studies have shown that a woman is less likely to get pregnant few days after completing her menstruation but very fertile around 12-14 days before her next period comes up.
This form of birth control doesn’t involve altering hormonal systems or blocking sperm from fertilizing an egg
Answer:
this phenomenon is a natural consequence of evolutionary processes and continental drift
Explanation:
Marsupials are mammals in which newborn offspring are carried in a pouch of the female (mother) body. On the other hand, placentals are mammals that complete embryo development in the mother's body, in the placenta. All the extant marsupials are endemic to Australia and the Americas. It has been shown that marsupials diverged (evolved) in South America, Australia and Antarctica when these landmasses were joined. In Australia, marsupials evolved to fit an ecological niche, which can be attributed to geographic isolation due to continental drift, while placental mammals are relatively recent and more scarce (mainly bats and rodents) within this region.
