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Vesnalui [34]
3 years ago
7

How does the molecular clock work?

Biology
1 answer:
sleet_krkn [62]3 years ago
8 0

It compares the number of mutations that exist in the DNA of two different species.


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Which organisms undergo Carnegie stages? A lizard B sheep C snail D worm YOU CAN CHOOSE MORE THAN ONE ANSWER!
ale4655 [162]

Answer:

Sheep

Explanation:

Carnegie stages can be described as the period of maturation in mammals. It is during this period that they develop most of the body parts and organs that is needed for them to survive in the outside world. There are about 23 stages which classify the ways each mammals form and develop various features on their bodies.

The Carnegie Stages of development are unique to mammals this is because mammals carry their young one in their wombs, they stay there deriving nutrient from their mother until they are ready to be born. From the options listed above the mammal among the animals, there is sheep. Hence a sheep undergo Carnegie stage.

6 0
3 years ago
The structures that receive the ovulated oocyte, providing a site for fertilization, are called the ________.
Neporo4naja [7]

Answer: B. fallopian tubes  

Explanation:

Fallopian tubes - consist of two channels that are located laterally to the uterine horns, and are responsible for capturing the female gamete released by the ovary into the peritoneal cavity, and its conduction to the uterus. For this, the tubes perform peristaltic movements and have eyelashes that push the gametes to the uterus. The fallopian tubes are attached to the upper part of the broad ligament, which is called mesosalpinx.

The sperm meets the ovum in the fallopian tube, and then they go into the uterine cavity. When this does not occur, there is an ectopic pregnancy because the development of the fetus occurs in the tube's ampoule, a phenomenon known as tubal pregnancy, which can culminate in the rupture of the fallopian tube, a situation that causes major bleeding.

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3 years ago
What is the mean of the highlighted section
RoseWind [281]
I wish i knew the answer to this.
3 0
3 years ago
How did insects become resistant to DDT
Galina-37 [17]

Answer:

A. Some were already resistant and were the survivors that could reproduce

Explanation:

Both resistant and susceptible insects will be exposed to DDT, but according to the evolution theory, it is expected that those insects that are resistant to the insecticide will be selected by natural selection. In consequence, the resistant individuals will survive to reproduce in the next generation.  

3 0
4 years ago
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Blizzard [7]

Global winds shape the Earth's climate by transporting heat and water vapor. They are caused by air pressure and moisture differences in the atmosphere from warm air rising to the poles.

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4 years ago
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