A controlled experiment is when the experimenter can change one variable in the experiment and completely change the results.
Redi experiment involved a closed jar with rotting meat on the inside. He waited for a few days and found no new forms of life in the jar.
He then did the same experiment, but this time he took the lid off the jar. After those few days he found there were maggots in the rotting meat from flies.
This is a great example of a controlled experiment, because he only had to change one variable to completely change the results. In this case that variable was just removing the lid from the jar.
Redi was trying to prove spontaneous generation with his experiment. Although, it failed.
Spontaneous generation: When life forms from non-livings.
Redi disproved spontaneous generation, but proved biogenesis.
Biogenesis: When life comes from other living beings.
He proved biogenesis because the flies had reproduced when the jar was opened.
Answer:
Those organisms survive and maintain its population who are chosen by natural selection.
Explanation:
This statement means that when the population experiences a new set of environmental conditions, two things are happened i. e. the population either adjusts through natural selection or becomes extinct. The fossil of dinosaur indicates that extinction occur due to changed in the environment. If the population made changes in itself and adapt the environment then the organism survive otherwise extinction occur.
Answer:
(B) Reduce his calorie intake to achieve a healthy weight
Explanation:
Research has shown that excess body fat or obesity increases the risk of cancer, since timothy is overweight, he needs to reduce his calorie intake to achieve a healthy weight
I agree because an ecosystem and a host are basically the same thing.
The correct answer is: B. the lysosomes.
Lysosomes are single-membrane organelles found in eukaryotic cells. Lysosomes are specialized vesicles created in the rough endoplasmic reticulum (rER) with a variety of enzymes inside it. Their function is digestion: of the food or of the cell when it dies and that function is performed via enzymes.
