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
-Dominant- [34]
3 years ago
6

Pls Help

Biology
1 answer:
kakasveta [241]3 years ago
4 0

Answer:

iop

Explanation:

You might be interested in
Biochemical recognition systems within the stigma of a flowering plant prevent the pollen from a different species from developi
Lena [83]

Answer:

B. pre-zygotic, lock and key

Explanation:

When pollens from the different species fall on the stigma of a flower from some other species, the chemicals released from the stigma do not allow the pollens to germinate. The pollen tube is not formed to carry the male gametes to the egg cell for fertilization. Since this process does not allow the formation of zygote between the male and female gamete of two different species, it is a pre-zygotic isolating mechanism.

Here, the pollens and stigma of different plant species are not compatible with each other and the structural incompatibility of the reproductive structures prevents fertilization. This represents the lock and key mechanism of reproductive isolation.

5 0
4 years ago
Read 2 more answers
Starting in 1850 when Europe become industrialized, the frequency of melanic forms of the peppered moth in populations ______ un
mash [69]

Answer:

increased; almost 100%

Explanation:

The peppered moth witnessed a change in its color and the number at the end of the eighteenth century. The reason behind this was the Industrial Revolution that led to an increase in air pollution. With the increase in air pollution, the dark-colored moths increased in the number. Later, when air pollution decreased, the light-colored moths started to predominate. It was in 1895 that the number of dark-colored moths increased to the maximum.

8 0
4 years ago
PLS HELP I DONT UNDERSTAND :( WILL GIVE BRAINLIEST + 25 POINTS!!! :D
Ludmilka [50]

Answer:

I think its the last one

7 0
3 years ago
Is a crab unicellular at multicellular
Effectus [21]
A crab is multicellular
3 0
4 years ago
Read 2 more answers
Your ________ system includes the blood , heart , and blood vessels . it moves materials to all parts of your body
SVEN [57.7K]
The answer is the circulatory system
4 0
4 years ago
Other questions:
  • Cone bearing plants are classified as .
    10·1 answer
  • Almost half the birds in the yard were brown cardinals and the rest were bright red cardinals, so jimmy perceived them as two di
    6·1 answer
  • Earthquakes occur along Earthquakes occur along a transform boundary. True or False
    11·2 answers
  • Write a short paragraph describing the role of all types of lipids
    8·1 answer
  • According to this punnett square, what percentage of the offspring will be female
    6·1 answer
  • The preservation technique that attempts to remove moisture is
    10·1 answer
  • In a controlled experiment, the variable that is changed to test the hypothesis is called the:
    10·1 answer
  • 22. Pollution can enter and contaminate an aquifer from which of the following?​
    11·1 answer
  • Which of the following animals belongs in class Cepholopoda?
    6·2 answers
  • In which situation would it be least likely for a scientist to revise her experimental methods?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!