In johann mendel’s experiments with cross-pollinating one hybrid purple-flowered plant with another, mendel calculated that in the second generation of plants, the ratio of purple to white was

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent