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
Reika [66]
3 years ago
14

The two main processes by which plant cells absorb, release, and use energy are

Biology
1 answer:
Tasya [4]3 years ago
7 0
<span>C)
photosynthesis and respiration. </span>
You might be interested in
A child has sickle-cell disease (ss) but neither parent is ill. What must be true of her parents genotypes?
timurjin [86]
I think the answer is B
6 0
3 years ago
Read 2 more answers
If the half-life of a radioactive atom is 3,500 years. How old is the substance if the parent-daughter ratio is 1:127?
balu736 [363]

Answer:

2.447 × 10⁴ years

Explanation:

Step 1: Given data

  • Half-life of the radioactive atom (t1/2): 3,500 years
  • Parent-daughter ratio ([A]/[A]₀): 1:127 (1/127)

Step 2: Calculate the rate constant

Radioactive decay follows first-order kinetics. We can calculate the rate constant (k) using the following equation.

k = ln2 / (t1/2) = ln2 / 3,500 y = 1.980 × 10⁻⁴ y⁻¹

Step 3: Calculate the time elapsed (t)

For first-order kinetics, we will use the following expression.

ln ([A]/[A]₀) = -k × t

t = ln ([A]/[A]₀)/ (-k)

t = ln (1/127) / (1.980 × 10⁻⁴ y⁻¹) = 2.447 × 10⁴ y

3 0
3 years ago
Describe an example of the first law of thermodynamics
kotegsom [21]

Answer:  According to the first law of thermodynamics, energy can be transferred from place to place or changed between different forms, but it cannot be created or destroyed. For instance, light bulbs transform electrical energy into light energy, and gas stoves transform chemical energy from natural gas into heat energy.

Explanation:

4 0
3 years ago
PLEASE HELP ME IM BEGGING YOU!!!!!!!!!!!!!!! Water plays an important role in the chemical weathering of rock. In 3–5 sentences,
Advocard [28]

Answer:

Water along with carbon dioxide and oxygen are the agents of chemical weathering to support that statement.

Explanation:

  • Chemical weathering is the continuous process that makes the rocks weak and decompose by changing its composition.
  • Water is the main agent for chemical weathering, the molecules of water separates the ions from their existing compounds and edges them.
  • Water has the ability to completely dissolve some minerals. for example, salt.
  • Oxygen also takes part in chemical weathering by the process called as oxidation.
  • Similarly carbon dioxide initiates weathering by the acid rain.
5 0
3 years ago
You are an archaeologist who has just found an ancient fire ring containing charcoal fragments. You send these fragments to the
Ede4ka [16]

Answer:Thus we can conclude that these charcoal fragments are about 11460 years old.

Explanation:

a) for completion of half life:  

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{5730years}=1.21\times 10^{-4}years^{-1}

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  = 100

a - x = amount left after decay process = 25

b) for completion of 75 % of reaction  

t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}

t=11460years

Thus we can conclude that these charcoal fragments are about 11460 years old.

4 0
3 years ago
Other questions:
  • Which of the following aids in the weathering and transportation of rocks? A. ice B. electricity C. sunlight D. clouds
    8·2 answers
  • What organisms does alcoholic fermentation take place?
    12·1 answer
  • You are exploring and observe some hardened sediment that contains the impression of a bone. This is an example of what type of
    10·2 answers
  • Click the statement that best describes the role of each element in living organisms.
    15·1 answer
  • An advantage of gas exchange in fresh water, compared with gas exchange in air, is that:
    12·1 answer
  • Which of the following diseases is passed on by inheritance?
    8·2 answers
  • What are the major characteristics of life
    14·1 answer
  • Three young children are fighting over where to take
    14·1 answer
  • Use the drop-down menus to identify the organelles labeled on the animal cell to the right.
    15·2 answers
  • 3) Which of the following is made by your body following the injection of a vaccine for a
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!