Organisms that have two identical alleles for a trait are said to be

A. homozygous.

B. heterozygous.

C. hybrid.

D. dominant.

Mitochondria and chloroplasts reproduce the same way free-living bacteria do-by

Which is best illustrated by Watson and Crick's ball-and-stick model of DNA? A. the importance of sticking to established methods of science. B. the role of creativity in scientific discovery. C.

Obsidian, pumice, and scoria have fine grained or no visible crystals because they were formed. a) (Cooled fast/Cooled slow) b) (inside/outside) c) (above the Earth's surface/below the Earth's surface) d) intrusive/Extrusive)

How does oxygen get into the blood from these air sacs?

When referring to osmosis, water moves from a hypotonic to a hypertonic environment t or f?

Find the median of 4.5, 7.5, 9, 9, 9.2, 9.3, 10, 10, 10.5 and 13

The octopus can change its skin color and coordinate its body posture and movement in such a way that it resembles a fish. predict why this behavior would evolve despite its costs.

Fossils of a species of bird are found in layer 3. Which layer is most likely to have organisms that lived at the same time as the bird species? A. Layer 5 B. Layer. C. Layer 2 D. Layer 7

Number datatype would be appropriate for a zip code. a. True b. False

What 2 resources might 2 species compete with