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
Andrei [34K]
4 years ago
9

Aquatic ecosystems consist of two different layers with respect to light. The photic zone is where light penetrates the water, a

t the surface and a little below. The aphotic zone is where the water is perpetually dark because the light cannot penetrate that deep into the water. The zone depths vary due to salinity and clarity of water.
Which of the following must be true about the organisms living in the aphotic zone?
A.
They have adapted to having no light for an energy source and are able to live in dark and cold areas.
B.
They all must move to the surface of the water once a day to receive adequate light energy.
C.
They have all become fluorescent so they can all be seen by one another.
D.
Many organisms have not been able to survive in the cold, dark waters, so population is low.
Physics
2 answers:
Lostsunrise [7]4 years ago
7 0

Answer: a

Explanation: it talks about how they live without that much light

Ivahew [28]4 years ago
4 0

Answer:

Answer A

Explanation:

Did the study island lesson

You might be interested in
An object moving due to gravity can be described by the motion equation y=y0+v0t−12gt2, where t is time, y is the height at tha
Lynna [10]

Answer: 6.45 s

Explanation:

We have the following equation:

y=y_{o}+V_{o}t-\frac{1}{2}gt^{2} (1)

Where:

y=0 is the height when the rock hits the ground

y_{o}=75 m the height at the edge of the cilff

V_{o}=20 m/s the initial velocity

g=9.8 m/s^{2} acceleration due gravity

t time

0=75 m+(20 m/s)t-(4.9 m/s^{2})t^{2}  (2)

Rearranging the equation:

-(4.9 m/s^{2})t^{2} + (20 m/s)t + 75 m=0 (3)

At this point we have a quadratic equation of the form at^{2}+bt+c=0, and we have to use the quadratic formula if we want to find  t:

t=\frac{-b\pm\sqrt{b^{2}-4ac}}{2a}  (4)

Where a=-4.9, b=20, c=75

Substituting the known values and choosing the positive result of the equation:

t=\frac{-20\pm\sqrt{20^{2}-4(-4.9)(75)}}{2(-4.9)}  (5)

t=6.453 s  This is the time it takes to the rock to hit the ground

8 0
3 years ago
In this experiment, you will use a track and a toy car to explore the concept of movement. You will measure the time it takes th
LenKa [72]
A question you can gather from this experiment is figuring out the distance traveled by the car, and how far it went. A simple solve of X equation could be used.
7 0
4 years ago
Read 2 more answers
Why do ionic compounds make good conductors when dissolved in water?
sveticcg [70]

Answer: The correct answer is B- The ions are free to move in water and carry an electric charge.

5 0
3 years ago
if you had a trapped gas and continued to cool it until the lowest possible temperature is reached the temperature is called
prisoha [69]
Absolute Zero.

Kelvin 0 is Absolute Zero, the atoms cannot physically become any closer.
Celsius -273.15
7 0
3 years ago
Read 2 more answers
What makes up a compound?
iVinArrow [24]
A
.....................
7 0
3 years ago
Read 2 more answers
Other questions:
  • If a bike rider travels 4 km in an hour,what is his speed measured in miles per hour?
    9·2 answers
  • A 1.70 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 1
    12·1 answer
  • Use the figure to help you find the weight (Fg) of the body if the tension in both wires is 3.7 newtons.
    8·1 answer
  • 5. In 1947 Bob Feller, a pitcher for the Cleveland Indians, threw a baseball across the
    6·1 answer
  • For how long a time must a tow truck pull with a force of 550N on a stalled 1200kg car to give it a forward velocity of 2.0m/s?
    10·1 answer
  • What is the minimum kinetic energy of the block at B, which is located at the top of the loop, so that the block can pass by thi
    11·1 answer
  • You are exiting a highway and need to slow down on the off-ramp in order to make the curve. It is rainy and the coefficient of s
    15·1 answer
  • How much work is done by a 120 N force in 5 meters? *
    15·1 answer
  • Brian is at school and wants to walk home. How far and in what direction should he travel?
    15·1 answer
  • A car increases velocity from 0 m/s to 15 m/s in 2 seconds. What is the car’s acceleration?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!