F a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying? A. A population B. An individual organism C. An ecosystem D. A community

Why do most barnacles live in water with a constant temperature

Put the following terms in the order that oxygen passes through them to reach your blood: alveoli, lung, trachea, nose, bronchi.

Which of the following materials is most porous? shale clay unsorted sand and rock loosely packed gravel

The red lines represent dna. true the model shows the correct polarity between the orange and red strands. the 5' labels refer to the end of the strand with a nitrogenous base. the model correctly shows an arrowhead on the 3' ends of the strands.

Which is an example of a behavioral adaptation? A. A beaver marks it territory with its scent. B. An egret has long legs for wading in the mud. C. A hummingbird has a long bill to reach the flower's nectar. D.

Which of the following distinguishes cellulose from starch

Which numbers identify the organelles that are present in BOTH plant and animal cells? A) 1, 2, 6 B) 1, 5, 4 C) 1, 6, 5 D) 1, 5, 2

What is directly responsible for an acquired trait

Which statement best describes a physical change? Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.

What are catalysts that speed up reactions in living things called? A. Biocatalysts B. Enzymes C. Cellular facilitators D. Polymers