Which of the following statements about weathering is true? a. physical and chemical are two types of weathering b. weathering occurs when rocks are subjected to the movement of wind or water c. humans are the only causing of water d. movement is required for weathering to take place.

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only

Which feature would you expect to find in a population in which sexual selection depends on male competition?