I guess the answer your looking for very much depends on your hypothesis. A controlled experiment is <span>experiment where a scientist (you/observer) tests their hypothesis by looking for changes occuring due to changing the variable. For example if you were testing to find the best soil to grow tomatoes, you'd keep everything the same but you'd be changing the type soil. </span>
Answer:
B
Explanation:
About 54O mil years ago the Camberian Explosion happened and in Camberian period major animal phyla appear according to fossil records.
Answer:
A dominant trait can be described as a trait which is dominant over a recessive trait. A recessive trait can be described as a suppressed trait which gets masked by a dominant trait.
When the two alleles of a gene for a trait are similar, they are said to be homozygous. When the two alleles of a gene for a trait are different they are termed to be heterozygous.
A cross between two homozygous pea plants will result in all of the offsprings being similar in phenotype and genotype to their parents.
Its 3 of the same molecule.