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Mashcka [7]
3 years ago
8

Which of the following most accurately describes what can be seen in the fossil record? A. The fossil record shows every organis

m that has ever existed on Earth and how each species developed from a previous species. B. The fossil record shows nothing useful about evolution or the history of life on Earth because it is too incomplete. C. The fossil record shows that extinction is a modern phenomenon. No species went extinct prior to two hundred years ago. D. The fossil record shows species suddenly appearing and disappearing. When one species goes extinct, another one usually takes its place.
Biology
1 answer:
Colt1911 [192]3 years ago
6 0

The correct answer is option-D

The fossil record shows species suddenly appearing and disappearing. When one species goes extinct, another one usually takes its place.  It provides with the snapshots of the past. It shows the changes over the past four billion years. It maybe unclear at parts but it does provide evidence that life is old and over time has changed. By studying fossil record the relation of different plants and animals can be figured out and it also tells us how old life is on earth. We can learn about extinct species and find out the reasons as well behind there extinction.


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Describe the role of the following in synaptic communication:______.
Scilla [17]

Answer:

1- Ionotropic receptors form ionic channels that allow certain ions to pass through the plasma membrane, and metabotropic receptors, which are associated with G proteins and have a modulating action on synaptic transmission.

2-Neurons communicate with each other through neurotransmitters, which are the molecules responsible for sending signals from one neuron to the next neuron. Neuromodulators also enter into communication between nerve cells.

3-Rapid PPSE occurs when postsynaptic nicotinic receptors on dendrites and neuronal cell bodies are activated through acetylcholine, which causes membrane depolarization and allows the entry of Na and Ca ions.

Acetylcholine also allows the activation of postsynaptic muscarinic receptors, which leads to the slow excitatory postsynaptic potential. This occurs when the channels are Ca and Na open and the K channels are closed.

4-When the neurotransmitters are attached to their receptors, the opening of the ion channels can be opened. This leads to two types of postsynaptic potentials being generated: postsynaptic excitation potentials (PEPs), if the membrane potential is depolarized, and the postsynaptic potential inhibitors (PIPs), if the membrane potential is hyperpolarized.

Explanation:

1-The importance of studying neurotransmitter receptors is that most of the drugs of clinical importance, such as anesthetics, anticonvulsants, etc., are based on the mechanisms of action of these receptors

2-Neurotransmitters allow them to produce or not action potential, serves to activate postsynaptic receptors and are capable of opening ion channels. On the other hand, neuromodulators are responsible for regulating the activity of ion channels.

3-The fast PPSE reaches 15 milliseconds. The slow PPSE lasts approximately 1-2 minutes.

4-PEPs occur when the ionic channels of Na + or Ca2 + are opened, while PIPs when the channels  of K + or CI- are opened.

8 0
3 years ago
2. How did the mass contamination affect wildlife in the area?
Alexus [3.1K]

Answer:

espero que te sirva

Explanation:

El número de animales salvajes que viven en la Tierra va camino de disminuir en dos tercios para el año 2020, según el informe Planeta Vivo de WWF, en el que se señala que la extinción parcial de especies está destruyendo el sustento biológico del que depende la humanidad. Este informe, el más completo realizado hasta la fecha, indica que las poblaciones de animales se desplomaron en un 58% entre 1970 y 2012 y todo apunta a que esta pérdida podrá alcanzar el 67% en 2020.

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3 years ago
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sergiy2304 [10]

Answer:

cooling of lava or magma makes igneous

sedimentary rock is formed when sediment gets deposited, and is hardened by compaction and cementation.

any rock can turn into a metamorphic rock when exposed to extreme heat and pressure

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3 years ago
If a cell has 8 chromosomes, how many chromosomes will each of its daughter cells have after mitosis?
Kisachek [45]

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From what I remember in my 9th grade biology class, it's usually half that amount.

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A life expectancy of 2 to 5 years less than peers.
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