Carol and Maria spread some dirt out in a flat pan. Their classmate Ben blew over the dirt with a straw. Some of the dirt moved and formed ruts and bumps. They propped up one end of the pan with a board so the dirt looked like a big hill. Then the girls sprayed the dirt with some water in a spray bottle. More dirt moved as the water ran down the hill. Both the wind and the water modeled what process? A) decomposition B) erosion C) gravity D) weathering

3) Which of the following statements aboutthe tundra biome is true?
a. It is the coldest biome.
b. There are no summers.
c. It is the driest biome.
d. It is covered with trees.

Natural selection operates on populations over many generations. Which of the following allows natural selection to occur?

The Michigan forests contain a variety of tree species. What happens to the tree population when a forest losses its diversity; when only one tree species dominates an area? Students in biology class conducted the following simulations to predict the effects oon one tree species due to the presence of an invasive insect species: the hemlock woolly adelgid. Simulation #1 - 1. 28 students were given a card marked with H for hemlock 2. Each student moves around the room to meet three other students and write their names on their card. 3. The teacher represents the hemlock woolly adelgid.. He touches one student who dies and sits down. That student reads the names on his/her card. 4. Each student named, also dies and also reads the names on their cards. 5. Continue to all the students sitting have read the names on their cards. Count the number of students still standing. Simulation #2 1. Students are given cards marked H - hemlock; JP - jack pine; F - balsam fir; A - aspen; B - birch. 2. Repeat steps #2 - #5 from Simulation #1. 3. This time ONLY the students marked H will sit down. The other species of trees do not die. Based on the students' simulations, what conclusion can be drawn?A)Biodiversity halts the impact of disease and/or insect damage in an ecosystem.
B)Planting hemlocks in stands by themselves will save the other tree species growing throughout Michigan.
C)By planting a variety of tree species, you reduce the impact of specific insect damage on a forest ecosystem.

Which of these is extinct?
a) Dodo bird b) Asiatic lion
c)Elephant d) Leopard

Sort the mutations based on whether their effects are harmful, beneficial, or neutral to the organisms that experience them.a mutation in a noncoding
region of DNA
a mutation that
Ancierses the ability
to store moisture
ina y environment
a color mutation
that decreases a
bird's chances
of sexual selection
a mutation in a gene
that does not change
protein synthesis
increased white
pigmentation on
a prey animal in a
Snowy environment
a mutation decreasing
a plant's height in
competition for light
Harmful
Beneficial
Netural

The first computers stored their results on paper cards?