A result of convergent evolution are the webbed feet of ducks and frogs.
Explanation:
The evolution of the animals, or rather the development of adaptive features, works in very interesting manner. It is very common in nature that animals that are closely related do not share similar characteristics, or the opposite, animals that are not closely related but share similar characteristics. The later case, is referred to as convergent evolution, where totally different animals have developed the same or very similar characteristics in order to be better suited for their environment.
In this case we have the ducks and frogs, and the webbed feet as shared adaptations, or feature. The ducks are birds, while the frogs are amphibians, and their last common ancestor has lived hundreds of millions of years ago. Despite that, both animals have developed webbed feet, and the reason for this has been that both animals have faced the same challenge, swimming and diving, and the webbed feet help them to be much faster and more agile in the water.
Other examples of convergent evolution (in the present and in the past) are:
- Hyena - Tasmanian devil
- Sandy cat - Fenec fox
- Smilodon - Thylacosmilus
- Bats - Birds
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Answer:
the endocrine system and the nervous system are the two major regulating and communicating systems of the body. During rest and exercise, the nervous system along with endocrine system regulate the body mechanism to initiate the maintenance of Homeostasis in the body.
both endocrine and nervous system are both together involved in the transmission of chemicals signals which are important for physiological processes in the body . The difference is that endocrine system uses Hormones while nervous system uses neurotransmitters for chemical signalling.
The main area of the brain where these system work together and perform their function collectively is Hypothalamus where they signal each other when they receive proper stimulus.
The organelle that temporarily breaks apart so that the DNA can divide up is the nucleus. Nucleus store most of the cell's DNA it is responsible for carrying genetic information. It is also responsible for generating genetic expression to ensure the proper activities of the entire cells.
The answer is Glucagon Increases. This works like this after
a meal of a rich carbohydrate, over four to six hours the blood glucose level
rise, leading to an increase in glycogen. Produced by alpha cells of the
pancreas and released in response to low blood glucose and epinephrine.
Secretion inhibited by high blood glucose and insulin. Stimulates glycogen
breakdown and inhibits glycogen synthesis
