Why is it difficult to classify protists? Select three options. There are many varying characteristics and exceptions to each type of protist. They have been previously categorized based on what they are not. They are all eukaryotes composed of one or more cells that contain nuclei. There are no exceptions to the characteristics of each type of protist. They are microscopic and therefore too small to study accurately. Recent studies show that protists have not descended from one common ancestor.

the answer is: metamorphic rocks often show the presence of fossils, also a

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correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.

answer;

-vessels in the chest

the diagnosis of angina pectoris literally means "vessels in the chest"

explanation;

-angina pectoris is the medical term for chest pain or discomfort due to coronary heart disease.it is the chest pain due to an inadequate supply of oxygen to the heart muscle. the pain is typically severe and crushing, and it is characterized by a feeling of pressure and suffocation just behind the breastbone.

agina pectoris is caused by reduced blood flow to your heart muscle. the blood carries oxygen, which the heart muscle needs to survive. when the heart muscle isn't getting enough oxygen, it causes a condition called ischemia