Answer:
1938
Explanation:
Matthias Schleiden was a German botanist who studied the plant's cell and its structure under the microscope. In 1938 he contributed to the cell theory and stated that every tissue present in the plant is made of or cells and an embryonic plant is produced from one single cell.
In 1939 another scientist Theodor Schwann proposed the same conclusion after studying animal cells and concluded that the basic unit of life is cell and every organism on earth is made up of one or more cells. Therefore Theodor Schwann and Matthias Schleiden have great contribution in cell theory.
Answer:
Directional
Explanation:
In population genetics, for natural selection to occur there must be a variation that will favor the survival of an individual.
Directional selection is a form of natural selection that occurs in the extreme end when an environment condition such as food favors one phenotype over the other.
This will make the allele Frequencies to shift towards the direction of the superior phenotype.
one of the most important rain forest predators, attacking a wide range of different primates, is the monkey-eating eagle. we know this because all forest primates have an identical alarm call that means, essentially, "Eagle!"
<h3>What are primates?</h3>
Primates are those forest animals that has highly developed brain and backbone.
Some of them are predators while others are source of food for predators known as preys.
Example of such predators are the monkey eating eagles which are capable of hunting monkeys as their preys.
Learn more about predators here:
brainly.com/question/26286956
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It is important to have more than one trial in a well- designed experiment because repeated trials can help reduce the effect of errors and it can increase the accuracy of the result of the experiment.
It enters as the suns energy and exits in heat energy.
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