BIOLOGY MIDDLE SCHOOL

Which agent of weathering breaks down limestone statues?A.
liquid water

B.
acid chemicals

C.
plants

D.
wind

Answers

Answer 1
Answer: B) acid chemicals is your answer

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True or false. Heterotrophs obtain energy through the process called respiration.
Please help! What is the structure labeled with the question mark? a. Motor neuron with synaptic terminal b. Synaptic vesicle with neurotransmitter c. Receptor protein with action potential d. Motor end plate with deactivation enzyme
10Points please help!!!Which phrase best describes DNA? A.the structure that sends signals to other parts of the cellB.the molecule that contains all the instructions for life C.the molecule that is formed by the action of RNA D.the structure directly responsible for controlling osmosis

How does sexual reproduction increase the genetic diversity among a population? ANSWER CHOICES: A) increasing mutation rate in offspring B) increasing mutation rate in parents C) copying genes from 1 parent to form many offspring D) combining genes from 2 parents into 1 offspring

Answers

I have to say D is the most logical answer
the answer is d) combining genes from 2 parents into 1 offspring

The variation that exists in a population of wild giraffes is usually the result of events that occur during

Answers

Sexual reproduction. Like most mammals, giraffes produce sexually, meaning that both parents contribute to the DNA of the offspring.

Are gametes exactly the same? Explain why or why not?

Answers

Because each gamete has a different combination of parental chromosomes and is the result of crossing over

. A person rides his bicycle several miles. What process is used by the cells in his legs to release energy at the beginning of the ride and at the end what cause the pain in his legs

Answers

Answer:

At the beginning, aerobic respiration is used by his legs to generate energy when there was still sufficient oxygen intake for energy to be generated via oxidative phosphorylation.

Towards the end of the ride, his legs are generating energy through anaerobic respiration due to insufficient oxygen intake to keep up with the energy requirement of his muscles as he cycles continuously. Through anaerobic respiration, pyruvate from glycolysis is converted to lactate by lactate dehydrogenase instead of being channelled to the mitochondria for oxidative phosphorylation. The accumulation of lactate in his muscles is what causes the pain in his leg. After he stops the activity, the pain would reduce as lactate is transported to the liver to be reconverted back into pyruvate.

Why does smoke appear to move when you look at it under a microscope?

Answers

Smoke particles are larger than air particles That's why we can see the smoke particles better than the air particles, gas particles always move at high speed, in random directions.The same things is happening to air particles When air particles collide with smoke particles, the smoke particle moves  the same direction as the air particle that hit it. When another air particle hits the smoke particle, it changes its direction to the second air particle, and so on. This is called Brownian motion
because its a gas and its always changing forms. hope this helped

Which is an example of a response to a stimulus A.loss of water from the body as a result of excess sweating
B.the thick fur on an animal to protect it from cold weather
C.an increasing heart rate when blood oxygen levels drop
D.the presence of allergens in the air

Answers

C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
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