You can bend over without toppling if your center of gravity
A. is above your support base.
B. extends beyond your support base.
C. is within your body as you bend.
D. none of the above.
Answer: A
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Invasive species are dangerous because
A) they are almost all predators, disturbing ecological relationships by eating other species. B) they carry viruses that spread disease in new ecosystems. C) the native species have not evolved with and adapted to these organisms. D) they tend to be secretive, going unnoticed in their new ecosystems.
Which of the following are the first cells in the blood that encounter antigens?
A) B cells B) dendritic cells C) macrophages D) T cells
What process(es) play key roles in soil formation?
A. Physical weathering B. Both chemical and physical weathering C. Chemical weathering
Describe three strategies to encourage biodiversity conservation on private lands
What will be an ideal response?