Which of the following statements explain why red blood cells
(rbcs) are highly specialized for oxygen transport?
(1) rbcs contain hemoglobin.
(2) rbcs lack a nucleus.
(3) rbcs have many mitochondria and thus generate atp aerobically.
(4) the biconcave shape of rbcs provides a large surface area for the inward and outward diffusion of gas molecules.
(5) rbcs can carry up to four oxygen molecules for each hemoglobin molecule.

(a) 1, 2, 3, and 5 (b) 1, 2, 4, and 5 (c) 2, 3, 4, and 5

(d) 1,3, and 5 (e) 2, 4, and 5

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. they result in either an individual having too many or too few chromosomes in their genome. what is the most likely cause of these chromosomal abnormalities?

Brepresent the dominant allele for brown fur, and b represents the allele for white fur. if two rabbits with the genotype bb reproduce, what are the possible phenotypes for their offspring