Which two reasons do marine animals make sounds underwater?

a. to seek out mates b to imitate humans

c. to ward off predators

d. to create music

e. to attract prey

Which two of these characteristics are examples of endoskeletons? A. scales in fish B. bones in mammals C. calcium-rich plates in echinoderms D. appendages in arthropods

How do scientists identify cancer stem cells?

Among the characteristics unique to animals is a. gastrulation c. sexual reproduction b. multicellularity. d. flagellated sperm

A scientsist is testing the effect of light on plants. He takes one plant and sets it on the window sill where it receives light for approximately 10 hours a day. The other plant he places in a dark refridgerator where it receives no light.

Which trait do ferns, gymnosperms, and angiosperms share?

Which type of reproduction is more likely to increase genetic diversity? why? type your answer here. 2. which type of reproduction typically happens more quickly? why? type your answer here. 3.

What is the driving force behind excess runoff after a big precipitation event

Hich of mr. helms' vital signs and lab values were abnormal?

Give an everyday example of diffusion in air

Explain why specific restriction enzymes must be used in DNA fingerprinting