Parasitism
There is parasitic (i.e. the wolf gets harmed while the parasite benefits) relationship between some types of parasites (like mites) and arctic wolves. The parasites dig into the wolves' fur and either lay eggs or just live there. This parasitic relationship causes itching for the wolves.
Answer:
<u>In the scientific method, theories offer explanations for facts.</u>
Explanation:
Scientific theory is based on complex observation, inference and experimentation techniques. Usually, the resulting reports are checked and peer-reviewed thoroughly before being accepted as explanations for facts evidence.
Thus, theories are rigorously tested, and verifiable explanations for facts which are based on observations.
Answer:
He founded the strongest evidence for the evolution theory.
Explanation:
Charles Darwin is known as the father of evolution. He explained theory of natural selection and its important role in evolution. The Darwin went on Galapagos Island with his ship HMS beagle.
Darwin returned after 23 years and published his book On the Origin of Species. Darwin Took long time because he had realized that his ideas on the theory of evolution is revolutionary and need time to build the evidence. The collection of evidence for the presentation of the strongest for the role of natural selection in evolution.
Answer:
1- DNA: a specific DNA sequence encodes a transcription factor which activates the expression of target genes involved in cell differentiation
2- RNA: short non-coding RNAs may bind to enhancer regions and thus activate the expression of target genes involved in cell differentiation
3- Environmental factor: temperature may control the expression of genes involved in cell differentiation pathways
Explanation:
The deoxyribonucleic acid (DNA) contains the genetic material required to encode proteins. Some of these proteins are transcription factors involved in the activation of diverse signaling pathways, including, for example, cell differentiation and proliferation. On the other hand, microRNAs (miRNAs) are short non-coding RNAs that have the ability not only to repress but also to activate transcription by binding enhancer sequences. The miRNA activation mechanism has recently been discovered. In consequence, some miRNAs may potentially activate the expression of target genes involved in cell differentiation (e.g., <em>c-myc </em>gene). Finally, environmental factors (e.g., nutrient availability, salinity, temperature, etc.) may also activate gene expression and thus control diverse pathways such as cell differentiation, cell proliferation and cell death (apoptosis).
