The horseshoe crab looks very similar to its fossil ancestor from the Jurassic era. Why has the horseshoe crab not evolved?

A. Its original form always remained well adapted to its environment.
B. The species was affected by natural selection.
C. The species did not pass on genetic information to its offspring.
D. The species underwent major mutations in a short period of time.

Answer:

Length of one stadium = 0.1556 km

Explanation:

We have the diameter of Earth = 12740 km

Thus, circumference (C) of Earth is

[tex]=2\pi \frac{Diameter}{2} \\[/tex]

[tex]=2\times \pi \times \frac{12740}{2}[/tex]

C = 40023.89 km

Eratosthenes was a Greek polymath. He was the first to calculate the circumference of Earth. He had observed that at local noon on day of Summer Solstice, when Sun is overhead for the locations on Tropic of Cancer, a place named Syene had zero shadow day. Also on the same day the objects in Alexandria casts shadow. This proved that Earth is spherical and not flat. He went further and calculated the Sun angle ([tex]\theta[/tex]) for Alexandria by using a Rod (Gnomon). He found the angle to be about 7°. He also knew the distance (D) between Alexandria and Syene which was 5000 Stadia.

Lets say length of one stadia = S km

He used this data and simple concept of geometry as given below:

[tex]\frac{\theta }{360}=\frac{D}{C}[/tex]

[tex]=\frac{7}{360}=\frac{5000 \times S}{40023.89}[/tex]

[tex]=5000 \times S = \frac{7\times 40023.89}{360}[/tex]

[tex]=S = \frac{7\times 40023.89}{360\times5000}[/tex]

S = 0.1556 km

Answer:

Explanation:

The uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones (areas with similar plant and animal communities).

Answer: The frequency of Wave 2 is double the frequency of Wave 1.

Answer:

The force needed is 400 Newtons.

Explanation:

The force can be determined by means of Newton's law.

[tex]F = m \cdot a[/tex]  (1)

Where F is the force needed to stop the football player, m is the mass of the football player and a is the acceleration.

[tex]F = (80 kg)\cdot (5m/s^{2})[/tex]            

[tex]F = 400 kg.m/s^{2}[/tex]

However, 1N = 1 kg.m/s^{2}

[tex]F = 400 N[/tex]

Hence, the force needed is 400 Newtons.        

Answer:

The organelle missing from E.coli is nuclear membrane.

Explanation:

A nuclear membrane is a double membrane that surrounds and protects the nucleus of a cell. The nuclear membrane is lacking because there is no need for one to protect a nucleus that does not exist. Bacteria cells are also prokaryotes, and all prokaryotes lack a nucleus.

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Answer:

D. Less and less of the moon.

Explanation:

Waning has the meaning decreasing. A waning moon is the moon that decreases in size and its illumination . Moon starts waning a day after the full moon. Its size keeps decreasing and ultimately it is not visible on the new moon day .

A day after the new moon, it starts increasing in size and brightness and is slowly visible each night, until it is completely shining on the full moon day again. This is the waxing of the moon, where its size keeps increasing.

Answer:

The shape will be elliptical hopefully this helps!

C)Weight

A)An attraction between two objects that have mass

B)Force decreases as distance increases.

grav force of massive planet increases your weight

Answer:

C)Weight

A)An attraction between two objects that have mass

B)Force decreases as distance increases.

Explanation:

With Earth's gravity being [tex]9.80 m/s^2[/tex] the mass is approximately 5.61 kg.

To calculate the mass of an object that weighs 55N on Earth, we need to use the formula for weight, which is w = mg, where w is weight, m is mass, and g is the acceleration due to gravity.

On Earth, g is typically [tex]9.80 m/s^2[/tex]

Therefore, we can find the mass of an object by dividing its weight by this acceleration due to gravity.

To calculate the mass (m) of an object that weighs 55N on Earth:

m = w / g

[tex]m = 55 N / 9.80 m/s^2[/tex]

This calculation results in a mass of approximately 5.61 kg.

The correct answer is C. Thermal conductivity

Explanation:

Conduction occurs as heat, electricity, etc. are transmitted from one body to another. In the case of thermal conductivity, this refers to the property of one material or body to transmit or conduct heat. This property is measured in Watts (energy) per meter(distance)-Kelvin (temperature). For example, the thermal conductivity of copper is around 385 while the one of ice is 1.6, which indicates copper has a higher capability to conduct heat. Thus, the degree to which a material can transmit heat is thermal conductivity.

Answer:

D  The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.

Explanation:

Good Luck ^^

The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. The correct option is D.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.

We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

Energy is absorbed by the water, increasing the kinetic and potential energy of the water molecules and converting them from a liquid to a gas.

Water molecules usually have the highest kinetic energy in the steam phase.

Thus, the correct option is D.

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Answer:

It is moving away from Earth.

Explanation:

As the source comes closer to the observer then we can say that its frequency will increase.

So here we know that

[tex]\frac{\Delta \nu}{\nu} = \frac{v}{c}[/tex]

here we know that

v = speed of the star

c = speed of light

now if we know that speed of the star is towards us then the frequency will increase and hence the wavelength will decrease.

So it is known as Blue shift

While if the star is moving away from us then in that case the frequency will decrease and hence the wavelength will increase.

So here it is known as Red Shift.

So here correct answer will be

It is moving away from Earth.