A valid phylogenetic tree must be rooted with an outgroup.
举一反三
- A<br/>valid argument must be a sound argument, but a sound argument is not<br/>necessarily a valid argument.
- A heap must be a full binary tree
- A heap must be a complete binary tree
- 在下面的一个物种的有根树（rooted tree）中，哪个（些）物种可能是比较近期分化出来的？【图片】
- Which of the following statements are true of valid consideration? A: Must be of adequate and sufficient value B: Must move from the promisee C: Must be given in every binding agreement D: May be given before a promise in return