2. Living things can weather and erode the Earth. Which statement is true?
A Lichen and plant roots secrete chemicals which cause chemical changes in rocks and cause physical
weathering
B. Lichen secrete chemicals which cause chemical changes in rocks and cause chemical weathering, but
plant roots split rocks apart through physical (mechanical) weathering,
C. All living things cause chemical weathering.
D. Living things only cause mechanical weathering

Match the type of adaptation to the correct example, structural adaptation functional adaptation behavioral adaptation example type of adaptation elephants live in herds to protect their young leaves of a rain forest plant species have a pointed tip that enables rainwater to drain off easily. camels have nostrils that they can close snakes produce venom to kill prey and defend themselves. earthworms coil when touched, as part of a defense mechanism. human skin darkens with increased exposure to sunlight.

The body is protected against harmful flu viruses by

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is