Which of the following choices is evidence that present-day vertebrates shared common ancestors? a. they all have hearts and feet

b. they display similar embryo development and share common genes that control development.

c. they have many bone structures that are unique to each species

d. they all thrive in a single ecosystem
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Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

How do living things obtain phosphorus

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from