Damming a river can cause a lake to form, and beavers build dams. Given these facts, what can cause lakes to form among the following options: - rainfall - beavers - erosion - loose soil - heat - spring - flooding - break off
beavers

Some viruses have an envelope of phospholipids and proteins, and enveloped viruses make their own membranes. Given these facts, some what make their own membranes among the following options: - fungi - insects - viruses - mammals - fur seals - humans - animals - sharks
viruses

Q: Adult echinoderms have radial symmetry, and starfish and sea urchins are also echinoderms. Given these facts, what has radial symmetry among the following options: - Most plants - an object - barnacles - Starfish - Trees - Cows - a prism - Coral
A: Starfish

Question: Erosion of soil has a negative impact on the environment, and weathering and erosion continue to shape it today. Given these facts, what has a negative impact on the environment among the following options: - harmful substances - weathering of soil - saving water - planting trees - deforestation - massive damage - recycling - enormous damage to homes
Answer: weathering of soil

*Question*
The looseness of soil has a positive impact on a plant 's roots' growth in that soil, and deep burrowing earthworms improve soil porosity, water movement and plant root growth. Given these facts, deep burrowing earthworms do what to the looseness of soil for root growth among the following options: - compact - improve - nutrients - destroy - erosion - support - decrease - Movement
**Answer**
improve

(Question)
The gravitational pull of the Moon on Earth 's oceans causes the tides, and ocean tides enter and leave the Bay twice a day. Given these facts, the gravitational pull of the Moon on Earth 's oceans causes water to enter and leave the bay when among the following options: - H20 - seasons - weekly - daily - slow - monthly - strong - annually
(Answer)
daily