Which of the following includes the biggest block of time?
The significance of a notochord in chordates is that it
The significance of a notochord in chordates is that it
All chordates have a vertebral column to protect the primary…
All chordates have a vertebral column to protect the primary nerve chord.
How many body segments do insects possess?
How many body segments do insects possess?
Which of the following is not a body segment found on an ins…
Which of the following is not a body segment found on an insect?
The demise of the dinosaurs was probably triggered by a larg…
The demise of the dinosaurs was probably triggered by a large asteroid hitting the Earth.
The function of the placenta in mammals is to nourish the de…
The function of the placenta in mammals is to nourish the developing young.
Which of the following cells is important in carrying oxygen…
Which of the following cells is important in carrying oxygen throughout the body?
The first Phylum to evolve and endoskeleton is the Echinoder…
The first Phylum to evolve and endoskeleton is the Echinoderms.
Food passing from the mouth to the stomach travels through t…
Food passing from the mouth to the stomach travels through the esophagus. What is the name given to the rhythmic wave of contractions that propels food through this tube?