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Lady bird [3.3K]
3 years ago
7

A scientific theory is an explanation that

Biology
1 answer:
Marina86 [1]3 years ago
3 0
D - A scientist has tested with an experiment 
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Name the five cardiac cycle activities starting with excitation and ending with regulation of blood flow and volume.
stira [4]

Answer:

Explanation:

1) Excitation brings about contraction.

2) Contraction leads to an increase in blood pressure.

3) Changes in blood pressure results in the opening and closing of the heart valves.

4) The opening and closing of heart valves then regulates the flow of blood and it's volume.

3 0
3 years ago
What happens to DNA after RNA polymerase has synthesized a mRNA molecule?
schepotkina [342]
Synthesized RNA will remain. I believe this is because the polymerase allows the DNA to close up & that’s how it forms its double helix. Then the RNA chain is displaced and the DNA will soon be re-formed.
6 0
3 years ago
Describe the stages of cellular respiration?
babymother [125]
<span>here are three main stages of cellular respiration: glycolysis, the citric acid cycle, and electron transport/oxidative phosphorylation. Glycolysis literally means "splitting sugars.". Glucose, a six carbon sugar, is split into two molecules of a three carbon sugar. Glycolysis takes place in the cell's cytoplasm.</span>
8 0
3 years ago
¿Todas las venas conducen sangre pobre en oxigeno?
Amanda [17]

Answer:

El aparato circulatorio unidireccional transporta sangre a todas las partes del cuerpo. Este movimiento de la sangre dentro del cuerpo se denomina «circulación». Las arterias transportan sangre rica en oxígeno del corazón y las venas transportan sangre pobre en oxígeno al corazón.

Explanation:

4 0
2 years ago
In terms of energy resources, how do wealthier, developed nations compare
Luden [163]

Answer:

D. People who live in wealthier countries tend to consume more energy per person.

Explanation:

People in wealthy countries have access to many technologies such as phones, televisions, and house appliances like coffee makers. All of these use energy. Wealthy people also tend to have larger houses that require more electricity to light and heat/cool. People in developing countries do not have access to these technologies or large houses that consume large amounts of energy. Additionally, people in poverty are unable to afford the levels of energy that wealthy citizens can. For these reasons, wealthier countries consume more energy per person.

6 0
2 years ago
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