Answer:
3, 2, 1, 4. (the second answer)
Explanation:
I think the correct answer would be the first option. Global belts of low and high air pressure are caused by horizontal air currents. Air current travels horizontally in the direction from low pressure to a high pressure zone. So, it is the horizontal movement of air that causes air pressure.
Answer:
B-Testes of species 2 are larger than testes of species 1.
Explanation:
Relatively bigger tests are associated with female and/or male promiscuity across a wide range of invertebrate and vertebrate taxa.
Short 1979; Harcourt et al. 1981;
Two general theories to explain the interspecific difference in test size were proposed: 1) sperm competition (Parker 1970) and 2) sperm depletion (Short 1981). Data available suggest that sperm competition in the evolution of the size of avian testes may be a more important selective force than sperm depletion. As a result, species-specific test size data were used in comparative studies, particularly of birds, as a convenient and supposedly reliable index of sperm competition levels which further leads to bird promiscuity.