Which of the following is not true concerning the impact of volcanoes?
a.
acid rain can result from volcanic eruptions.
b.
tephra are a combination of water and rubble.
c.
damage can continue for years after the initial eruption.
d.
the volcanic explosion is the pyroclastic flow.

When analyzing tree rings, what do scientists assume a thin ring indicates?

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables

In a cladogram, what occurs at a node? a derived trait appears. evolution is stopped. an ancestor dies. the cladogram ends. aa as s as ss what are the chances that their offspring will have sickle cell anemia? 0% 25% 50% 100%