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Oksana_A [137]
3 years ago
5

What type of reaction is combustion of coal? A. endothermic B. physical C. heat-absorbing D. exothermic

Biology
2 answers:
nydimaria [60]3 years ago
4 0
Exothermic - hope that helps x
Leni [432]3 years ago
4 0

Answer:

Redox Reaction

Explanation:

Burning coal is a chemical change called combustion. A combustion is the chemical reaction (redox reaction) of coal with oxygen O2. It is exothermic, which means it releases energy : hence the heat.

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Explain why the use of the term “theory” in science is different from the use of the word “theory” in everyday language.
kari74 [83]

Answer:

In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena".

Explanation:

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What is the skeleton of an embryo made of?
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Hope this helps :3
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What is the definition of antigen
SIZIF [17.4K]
A toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
7 0
3 years ago
Help please will give brainliest due soon
kykrilka [37]

Answer: Hi there, I'm so sorry no one answer your question here is what I got

The nervous system makes you thirsty. The integumentary system makes you sweat.

The hypothalamus is part of the nervous system and controls vegetative functions, such as hunger, thirst and body temperature. When you run a race, your body starts to lose fluids due to sweat. At that moment the nervous system (through the hypothalamus) trying to maintain homeostasis in your body signals that you are thirsty.

As already mentioned above, when you participate in a race you start to sweat. This is a reaction of the integumentary system, through the skin, releasing fluids to regulate your body temperature.

Explanation:

3 0
3 years ago
How can bacteriophage dna be spread from cell to cell without causing cell death?
nexus9112 [7]

Answer:

through lysogenic cycle

Explanation:

The bacteriophage attaches itself on the bacterial surface. The DNA strand to be replicated is injected into the bacteria by the bacteriophage. The DNA integrates into the bacterial chromosome and  becomes a pro-phage.

The bacterial cell proceeds to cell division  through budding. The progeny possess the bacteriophage. After complete replication, the virus DNA  detaches from the host genome and enters the lytic cycle. The capsid heads assemble on the surface of bacterial cell to package the fully matured viral DNA . The phage produces lytic enzymes that weaken the cell wall of bacteria cell.

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