(x-3)² = (x-3)(x-3)
= x² - 3x - 3x + 9
= x² - 6x + 9
The correct answer is - She observed a fossil with skeletal structures similar to certain modern organisms.
The scientists was able to come to the conclusion that certain organisms have common ancestor because she was able to study and see the skeletal structures of extinct species and compare them with modern day species, and they had a big resemblance.
The skeletal structure is something that needs a lot of time to change, millions of years. Even then, the basics of the structure will be the same, with the further modifications in place on top of it. It is something that is very useful when comparing extinct species and modern day species, as it can give a nice clue about their connection and common ancestry.
The cats for example, the modern day ones and the first ones that appeared, have almost the same bone structure, where even a trained eye finds it hard to find a difference, and that is a very nice clue about tracing the ancestry.
Fern is the answer to this question
The question is basically asking which of these can be known by just looking at the coin. It cant be the last one because we don't have time to research about the influence Indians had on us history. The first one is wrong because we are just looking at the coin, we don't know anything about it other than it's outside appearance. We are once again taking a look not studying the coin so we can eliminate the second one.
<span>There is a woman’s face on one side of the coin. That is an observation, be cause its obviously presented. Observations are a crucial element when performing lab's in biology. </span>
<span>Hope I helped. :) </span>
Respuesta: la especie es un conjunto de individuos con características biológicas similares, una población es la cantidad de animales de una misma especie.
Ejemplo:
Especie, un humano
Población, muchos humanos