Which organisms produced oxygen in the atmosphere of early Earth?
a. Fungi
b. Grasses
c. Red algae
d. Cyanobacteria
e. Green Alga
d
You might also like to view...
Explain the tuberculin test, including visual identification and immunological interpretation of positive and negative results, and describe why a positive test does not indicate an active infection
What will be an ideal response?
Why is color-blindness more common in males than in females?
a. Because females would have to receive one copy of the recessive color blindness gene to actually express the trait. b. Because a male only needs to receive the recessive gene from his mother to be color-blind. c. Because color-blindness is an Y-linked trait. d. Females are hemizygous e. Males are never hemizygous
Pressure in the middle ear is equalized with the external air pressure through the auditory tube
Indicate whether the statement is true or false
Clonal selection occurs when
A) daughter cells differentiate into memory B cells and plasma cells. B) antigen-antibody binding causes selected B cells to multiply. C) natural selection favors specific white blood cells and they multiply rapidly. D) antibodies that are the most common become cloned. E) scientists clone antibodies for specific diseases and use them to prepare vaccines.