Answer:
The answer should be C
Explanation:
If you look at the the graph, C points to the time period after mammals appeared. Since birds are mammals, they should have appeared after the time that mammals first came to be on Earth.
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The answer to this question is C. Do Work. I hope this helped! Comment if you have a question. :)
Answer:
15. Current increases
16. 4 Amp
17. Current decreases
18. A direct relationship
19. voltage affects current
20. Current is unchanged
Explanation:
First you need to know about Ohm's Law. Ohm's law can be summarized in the formula:
where:
V = Voltage
I = Current
R = Resistance
As you can see, when you increase the voltage, the current increases as well. When you decrease the resistance, current increases as well. This means that voltage has a direct relationship with current, and current has an indirect relationship with resistance.
Voltage is the potential, or electrical potential energy that pushes the current along a circuit. THe current is the flow of energy, so it is actually the rate of electrical energy that goes through a point in a circuit over a period of time. The resistance is the resistive force, that the current goes through as it goes through a circuit.
Let's apply that to question 16:
Our given:
V = 6V
R = 1.5Ω
In question 17,just to show you, we can solve it and compare:
<u>6 V battery and 3Ω resistance:</u>
<u>3 V battery and 3Ω resistance:</u>
Current decreases from 2A to 1A.
Let's try it on Question 20:
<u>12V and 5Ω</u>
<u>6V and 2.5Ω</u>
There is no difference.
Answer:
the thin filaments are pulled away from one another, thereby reducing their ability to interact with myosin
Explanation:
The myofibril is the basic unit of a muscle cell. Each myofibril is composed of contractile units known as sarcomeres which may contain two different types of myofilaments: thick myofilaments and thin myofilaments. The thick filaments are known to have a constant length, and they consist especially of myosin proteins. These filaments (thick) do not extend to the ends. On the other hand, the thin filaments extend in from each end, and they are mainly composed of actin proteins that serve as tracks for the movement of myosin proteins.