What feature of the fossil Pikaia led scientists to classify it as a chordate?

A. Tentacles

B. A definite head region

C. A notochord

D. Segmentation

Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilagenous skeletons. how are they different from lampreys?

Why is the convolutions in the cerebrum important? And what do they increase?

Interneurons A) are found only in the central nervous system. B) carry only sensory impulses. C) carry only motor impulses. D) only connect motor neurons to other motor neurons. E) are found between neurons and their effectors.

A leech feeding off of human blood is an example of 1 commensalism competition mutualism parasitism predation

Which biome would contain the most biodiversity in deciduous tree species? A) taiga B) savanna C) temperate forest Eliminate D) tropical rainforest

Which of these would probably occur from under-coverage? A. Interviewers influencing the responses to questions B. Questions that are poorly worded C. Results not reflecting the population D. People lying when they answer survey questions

Which of the following chemical compounds is not an amino acid? (1) Glycine (2) cysteine (3) glutamic acid (4) Ribose

Which of the following describes a relationship of commensalism? A. Oxpecker birds eat parasitic ticks off the backs of zebras B. The tapeworm latches itself in the intestines of a rat feeding off all the nutrients eaten by the rat C.

What lunar phase is required for a lunar eclipse? A New B Full C Half

In a classic experiment carried out by the biologist Hopkins in the 20th century, 20 young rats were divided into two groups.