Answer: A. True
Explanation: Cell receptors are proteins that receive signals and trigger a signal cascade for the cell can respond. There's many types of receptors, depend of their location and their enzymatic activity, and each type can recognize certain signals. For example, tyrosine-kinase receptors can recognize growth factors, JAK associated receptors can recognize cytokines, etc. That specificity is given by the structure of the receptor and the structure of the signal.
Biomass may contribute to global climate change because certain trophic levels produce greenhouse gases.
<h3>What are greenhouse gases?</h3>
Greenhouse gases are specific types of gases that can maintain heat (solar radiation) on Earth's surface and thus increase Earth's temperature.
The ruminant animals produce methane, which is an important greenhouse gas associated with the global climate.
In consequence, the sudden increase in animal husbandry due to human activities may also increase the effects of climate change.
Learn more about greenhouse gases here:
brainly.com/question/14507701
<h2>Answer:</h2>
Uracil
<h2>
Explanation:</h2>
Uracil is the nitrogenous base that is found in RNA but not present in DNA.
Cytosine (C) and thymine (T) are the smaller pyrimidines. RNA also contains four different bases. Three of these are the same as in DNA: adenine, guanine, and cytosine. RNA contains uracil (U) instead of thymine (T).
The part of the river that would have animals with very muscular bodies and adaptations that survive in turbulent water is the transition zone.
