The palila Loxioides bailleui has an adaptation that allows it to feed mainly on the seeds of the mamane plant The seeds are toxic to most other birds The one ...

Prophase II The chromosomes condense Spindle microtubules attach to each sister chromatid as the nuclear envelope breaks up Metaphase II The still duplicated chromosomes are aligned midway between poles of ...

digestive gland eyespot ossicle (tiny skeletal structure) spine

Spriggina, an Ediacaran, lived about 570 million years ago. It was about 3 centimeters (1 inch) long. By one hypothesis, it was a soft-bodied ancestor of arthropods, such as trilobites