Sometimes the reflex response is diminished or absent- a phenomenon termed hyporeflexia. Do you think hyporeflexia would be caused by disorders of the central nervous system or the peripheral nervous system? Explain your reasoning.


Answer 1


The functions of the skeletal muscles are affected by the CNS via the two sets of neurons, that is, lower motor neuron and upper motor neurons. The PNS comprises sensory neurons and motor neurons. The lower motor neuron is monitored by the upper motor neuron.  

Hyporeflexia occurs because of the dysfunction of the lower motor neuron or its lesion. The lower motor neurons refer to the neurons, which innervate the skeletal muscles directly. Destruction to the central nervous system leads to hyper reflexes and destruction to the peripheral nervous system results in hyporeflexia.  

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The plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. The magma then emerges as lava from the boundary and cools, creating a new crust.

An adolescent growth spurt occurs only in boys.
a. True
b. False


The correct answer is B. False


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The answer is false
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Humans originated in Africa about 7 million years ago: if life on earth started 3.5bya ago and represented 24 hours from then to today, how many minutes of these 24 hours would be devoted to this 24-hour clocka) since the first humans showed up?
b) since Humans showed up 300,000 ya?


I don’t quite understand the answers that you’ve provided to choose from, but if we are comparing those millions of years to a 24 hour clock, then humans have only been around for 2.88 minutes of out the entirety of life on Earth.
Sorry if this didn’t answer your question, but I hope this somehow helps.

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Molecularly speaking, when you look at a tree, what are you actually look at?



A heterogeneous mixture of water, carbon dioxide, oxygen, glucose molecules  

Final answer:

At a molecular level, looking at a tree involves observing atoms and molecules that combine to form more complex structures such as cells, tissues, and organs. These microscopic structures support the tree's growth, function, and ability to adapt to its environment. Thus, a tree represents various levels of biological organization.


Molecularly speaking, when you look at a tree you're witnessing an array of complex structures that form the basis for life. This includes atoms, the smallest and most fundamental units of matter that form molecules. Many biologically important molecules in the tree are macromolecules, large molecules formed by polymerization where smaller units called monomers combine. These molecules are significant components of the tree's cells which are the fundamental building units of life.

Additionally, what you're also seeing are elements of the tree's structure including tissues and organs that are formed by these cells. For instance, the tree's leaves contain specialized cells like guard cells which help regulate gas exchange. On a larger scale, these molecules and cells also contribute to the overall health, function, and resilience of the tree in its ecosystem.

Therefore, when you look at a tree, you're essentially witnessing numerous levels of biological organization. These range from the level of molecules and cells up through tissues and organs, to the entire tree or organism itself. This allows the tree to grow, function, and adapt to its environment.

Learn more about Molecular Structure of a Tree here:


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Answer: Insects


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Arthropods are divided into the following classes:

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- Myriapods

Thus, insects contains the greatest number of species

Answer: Insects.


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