In an effort to learn more about the wild lemur population in Madagascar, a researcher wants to collect a sample. Which statement is true?
The researcher can assign each lemur a number and then use systematic sampling.
It is possible to collect a simple random sample of all wild lemurs in Madagascar
Sample bias is inevitable because the researcher can only collect a convenience sample.
To reduce time and cost, the researcher must collect a volunteer sample.

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Step-by-step explanation:

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proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc