Over the past 50 years, the atmospheric level of carbon dioxide has

a. decreased.
b. increased slightly.
c. more than doubled.
d. stayed the same


C

Biology & Microbiology

You might also like to view...

Further evolution of the protostomes changed the coelom by

a. losing it. b. reducing it. c. it becoming a pseudocoel. d. all of the above.

Biology & Microbiology

Which gas is increasing in the atmosphere and

intensifying the greenhouse effect? a. carbon dioxide b. carbon monoxide c. ozone d. nitrogen e. oxygen

Biology & Microbiology

During male ejaculation ____

a. smooth muscle of the vas deferens contracts b. prostate contractions are inhibited c. sperm are forced into the epididymis d. the seminal vesicles secrete fluids into the testes e. the bladder sphincter is relaxed

Biology & Microbiology

________ are lymphocytes that originate in the bone marrow but then mature in the thymus

Fill in the blank(s) with correct word

Biology & Microbiology