Answer:
First, second, and last are correct statements.
For accuracy and reliability of any experiment, a number of observations must be as large as possible. It reduces the effect of any observation or any event which might have happened by chance or error.
Thus, finches were better to record observations as they were available in large number as compared to the tortoise.
In addition, the life cycle of birds is smaller as compared to the tortoise which enabled the scientists to observe more generations.
Lastly, the birds were easy to capture and track as compared to the tortoise. Tortoise being an amphibian could live on land as well as in water which made it difficult to track them.
Answer: yes, it is necessary.
Explanation: if an organism were to stop reproducing, the entire species would become extinct. Reproducing maintains an organism and the ecosystem it lives in.
Answer:
The mitotic spindle is a microtubules-based bipolar structure that segregates the chromosomes in mitosis
Answer:
The color of the flowers is generally caused by anthocyanin pigments
Explanation:
Anthocyanins are hydrosoluble vacuole pigments from the family of flavonoids. Anthocyanins are characteristics of flowers that have distinct colors depending on the pH (i.e., red, blue, purple, etc). These phytochemicals are commonly present in different parts of the plant including stems, roots, leaves, flowers and fruits.
Carotenoids, another type of phytochemicals, are known to confer their color to tomatoes and carrots. It is a class of isoprenoid pigment that produces yellow and orange colors.
Finally, betalains are another type of glycoside pigments that may also confer color to plants.