Which step is part of internal respiration? A. Oxygen rich Blood is taken up by the tissues
B. Air is inhaled through the nostrils
C. Air is exhaled through the nostrils
D. Gaseous exchange of oxygen and carbon dioxide occurs at the alveoli

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

What is a cordon and where is it found

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.