Answer:
A is correct external fertilisation doesn't require sexual intercourse
The evolution of giraffe.
The giraffe is a long necked animal that is found in most parts of the countries nd is herbivorous animal. It has a neck that is evolved to reach the tallest parts of the trees. The millions of years ago the ancestors of the giraffe family sed to at the grass leaves on the ground.
Thus the answer is adaptation and changing preferences.
- The long neck of the giraffe is a sign of the genetic evolution and a sign of adaptation of the spices towards the changing environment.
- The long neck of the giraffes is due to their adaptation. Over the millions of years the environmental factors as search for food, survival and changes in body size.
- Thus the giraffes changed due to the survival of the fittest.
Learn more about the ancestors of giraffes had short necks.
brainly.com/question/15216918.
Answer:
time and amount
Explanation:
tube c became clear because of the amount of protein and the amount of time it took the protein to become clear.
B- black allele;
b- brown allele;
The parental cross is true-breeding because both the male and the female are homo zygotes, so: BBx bb
The F1 generation will be all black heterozygote: Bb
The F2 generation will be between mice of the F1 generation and they all have the same genotype:Bb xBb
In this cross it would result in:
1/4 of the plants being black homozygote-BB 25%
2/4 of the plants being black heterozygote- Bb- 50%
1/4 of the plants being brown homozygote- bb- 25%
answer: 25%+25%=50% are homozygotes
