Answer:
What animal phylum do leeches belong in?
Explanation:
Leeches are segmented parasitic or predatory worms that belong to the phylum Annelida and comprise the subclass Hirudinea. They are closely related to the oligochaetes, which include the earthworm, and like them have soft, muscular, segmented bodies that can lengthen and contract.
A. the surface of the ocean. They need light for photosynthesis so they cannot live on the bottom of the ocean.
Answer:
Explanation:
Allosteric Enzymes Enzymes sometimes act as their own regulators. Such enzymes are known as allosteric enzymes. One such enzyme is aspartate transcarbamoylase (also known as aspartate carbamoyltransferase),
Answer:
The correct answer is option A) "a character that originated in an ancestor of the taxon".
Explanation:
A shared ancestral character is defined as a character that originated in an ancestor of the taxon. This type of characters contrasts with shared derived characters, which are characters that develop within the taxon and do not include all the ancestors of a given phylogenetic tree. For instance, the presence of four limbs is a shared ancestral character for a large group of animals, including amphibians, birds, mammals, turtles, crocodiles, among others.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.