1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrej [43]
2 years ago
9

Horseshoe crabs, or Limulus polyphemus, are very common along the east coast of the US. Fossils of horseshoe crabs have revealed

that they have changed very little in the past 300 million years. Which statement best explains why this is the case?
A.Horseshoe crabs have a low reproductive rate.

B.Horseshoe crabs need to change only if humans are present in their environment.

C.The horseshoe crab is well adapted to its environment. and its environment has not changed much in the last 300 million years.

D.Horseshoe crabs have a high mutation rate.
Physics
2 answers:
liubo4ka [24]2 years ago
5 0
The answer to your question is C
AnnyKZ [126]2 years ago
4 0
The answer to this question is C
You might be interested in
Along the remote Racetrack Playa in Death valley, California, stones sometimes gouge out prominent trails in the desert floor, a
REY [17]

Answer:

   F = 196 N

Explanation:

For this exercise we will use Newton's second law,  we define a reference system with the x axis in the direction of movement of the stones and the y axis vertically

Y axis  

       N- W = 0

       N = mg

X axis

       F -fr = ma

In this case, they ask us for the force to keep moving, so the stones go at constant speed, which implies that the acceleration is zero.

       F- fr = 0

       F = fr

the friction force has the equation

       fr = μ N

       fr = μ mg

we substitute

        F = μ mg

let's calculate

         F = 0.80 9.8 25

         F = 196 N

8 0
3 years ago
Which experiment best shows water’s ability to act as a solvent? raise the temperature of water and record its boiling point. fr
IrinaVladis [17]
The vanishing of an ionic solid (like table salt) would be an example of acting like a solvent
8 0
2 years ago
Read 2 more answers
Four students are each pushing on one side of a box. Mara is pushing to the west, Cindi is pushing to the east, Chris is pushing
jenyasd209 [6]

Answer:

cindi

Explanation:

cindi's work done is larger than all the other students combined

5 0
2 years ago
Sitting in a chairlift, Rebecca has a gravitational potential energy of 5,997.6
stira [4]

Answer:

B) 12 m

Explanation:

Gravitational potential energy is:

PE = mgh

Given PE = 5997.6 J, and m = 51 kg:

5997.6 J = (51 kg) (9.8 m/s²) h

h = 12 m

8 0
3 years ago
Remember to include your data, equation, and work when solving this problem.
andrezito [222]

Answer:

F = 0.00156[N]

Explanation:

We can solve this problem by using Newton's proposed universal gravitation law.

F=G*\frac{m_{1} *m_{2} }{r^{2} } \\

Where:

F = gravitational force between the moon and Ellen; units [Newtos] or [N]

G = universal gravitational constant = 6.67 * 10^-11 [N^2*m^2/(kg^2)]

m1= Ellen's mass [kg]

m2= Moon's mass [kg]

r = distance from the moon to the earth [meters] or [m].

Data:

G = 6.67 * 10^-11 [N^2*m^2/(kg^2)]

m1 = 47 [kg]

m2 = 7.35 * 10^22 [kg]

r = 3.84 * 10^8 [m]

F=6.67*10^{-11} * \frac{47*7.35*10^{22} }{(3.84*10^8)^{2} }\\ F= 0.00156 [N]

This force is very small compare with the force exerted by the earth to Ellen's body. That is the reason that her body does not float away.

6 0
2 years ago
Other questions:
  • What are the cons of using a cup made of ceramic
    15·2 answers
  • What type of front involves fast moving thunderstorms and severe weather?
    15·1 answer
  • Let the resistance of an electrical component remain constant while the potential difference across the two ends of the componen
    15·2 answers
  • 0.0000302 in scientific notation
    5·2 answers
  • Once out in space, the space shuttle needs to ________________ to keep going in the same direction at the same speed.
    12·2 answers
  • A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.5 m/s2 . The driver then applies the brakes, caus
    13·1 answer
  • Which copper wire would have the lowest resistance?
    10·2 answers
  • Suppose the ice caps at the South and North poles melted due to the global warming and the water was distributed uniformly over
    7·1 answer
  • How does running involve science..? please dont copy off of something
    14·2 answers
  • How many lines does each stanza contain?<br><br> 2<br> 3<br> 4<br> 6
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!