Which characteristic of four different dinosaur fossils makes a dinosaur most similar to the present-day birds?

1. Hollow bones. Like present day birds most if not all dinosaurs had hollow bones.

2.Quill knobs. Quill knobs are small bumbs in the wings of birds where primary flight feathers are, although most non avian dinosaurs couldnt fly, some such as concavenator, velociraptor, dakotaraptor, and many more have these quil knobs where feathers are likely to be.

3. Wishbone. Many theropod dinosaurs including the mighty tyrannosaurus rex, had a wish bone just like the birds of today.

4. Structure. Even though it may not be entirely obvious, birds have tiny tails, feathers are attached to those tails. The tail of birds are simulure to dinosaurs, the only difference being size. Not only that, but both birds and dinosaurs have a reversed first toe.

Hope this helps.

Explanation:

the answer is d.) homologous; have mammary glands

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.