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
LiRa [457]
3 years ago
14

The table below shows the initial and final masses of a radioactive material whose half-life is 15 years.

Biology
2 answers:
Murljashka [212]3 years ago
7 0

Answer:

A

Explanation:

1 half-life = .4 kg = 15 years

2 half-life = .2 kg = 30 years

3 half-life = .1 kg = 45 years

4 half-life = .05 kg = 60 years

Burka [1]3 years ago
4 0

Answer:

A

Explanation:

Initial mass is 8. The half-life is 15 years.

1st half life=.8/2=.4

2nd half life=.4/2=.2

3rd half life=.2/2=.1

4th half life=.1/2=.05

For each half life that it took it to go from .8 to 0.05, you add 15 years since that is the half life of the substance. 4*15=60.

So, the answer is A. The material decayed from 0.8 kilograms to 0.05 kilogram in 60 years.

You might be interested in
_____ can be prescribed to therapeutically lower cholesterol levels.
maxonik [38]

Answer:

Niacin  can be prescribed to therapeutically lower cholesterol levels.

Explanation:

Niacin, known as vitamin B3, is used to reduce the risk of heart attack or stroke in people with high cholesterol. Niacin has gained popularity in the last 50 years and is mainly used to raise the level of HDL (high density lipoprotein) cholesterol, also known as good cholesterol and lowering bad cholesterol levels.

However, niacin can cause health damage, so it should always be used with medical supervision.

7 0
4 years ago
Yo can somebody give a simple defintion of a liver (THE POINTS)
weqwewe [10]
Liver- a vital organ only found in vertebrates which detoxifies various metabolites, synthesizes proteins and produces biochemicals necessary for digestion and growth. In humans, it is located in the right upper quadrant of the abdomen, below the diaphragm.
6 0
3 years ago
Based on the trilobite fossil, what can you infer about the rock layers in these location? Layer a is 500 million years old. Lay
frozen [14]

Answer: Layer a is 500 million years old.

Explanation:

Trilobite is a member of the group of extinct arthropods found as fossils and they can be identified by the three-lobed as well as three segmented forms. These were the marine animals. These were appeared initially in the Cambrian Period. They used to live 542 million years ago so the fossils can be estimated to be aged of 500 above years old. These animals used to dominate in the sea area.

5 0
3 years ago
Which of these statements is not true of the phylogenetic tree?
ivann1987 [24]

Answer:

The answer is A.

Explanation:

Phylogenetic trees are only concerned with hard data (time points of when species evolve) and not soft data like how great a species is.

3 0
3 years ago
What is the expected phenotype of F1 progeny from a cross between two homozygous recessive mutants disrupted in different genese
LenaWriter [7]

Answer:

The correct answer would be - wildtype.

Explanation:

Let assume there are four genes which are :

A-B-C-D

In mutant first, the genotype would be:---a-b-C-D

In the mutant second, the genotype would be:--A-B-c-d

If both of these genotypes are crossed with each other, the recessive genes a, b of mutant first is dominated and masked the expression by the dominant genes present in the mutant second.

Similarly, the recessive genes of the mutant second are dominated and masked expression by the dominant genes of mutant first.  This is possible only due to different genes are present in mutants.

Thus, the correct answer is - The correct answer would be - wildtype.

6 0
3 years ago
Other questions:
  • Any disorder associated with the Y chromosome
    11·1 answer
  • Within a population of fish, ____________ exists in the form of body color. Some fish are orange and some fish are red.
    13·2 answers
  • 01.04 LC)Water is often called the "universal solvent" because many substances can be dissolved in water. What property of water
    11·2 answers
  • Question 1 unsaved in the experiment, resistance will be measured using what instrument? question 1 options:
    9·1 answer
  • Choose the statement that best describes the colonial attitude before the 1760's.
    7·1 answer
  • Ecoribi is a common Used to cut dna cloning
    9·1 answer
  • After reading about the scientific method, explain why it's important to follow the steps outlined in the scientific method care
    8·2 answers
  • I need help woth this question
    11·1 answer
  • A jogger has stepped in a pothole and sprained his ankle. What organ systems
    5·1 answer
  • Which statements describe oceanic crust? Select the two correct answers.
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!