A scientist rubs an unknown mineral against samples of calcite and apatite. The mineral leaves a scratch on both samples. Which of the following is the unknown mineral? (A)fluorite (B)apatite (C)calcite (D)gypsum

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation