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

What is the role of capillaries in the body?

A marine biologist analyzing water samples notices a protist with a calcium carbonate shell that moves by pseudopodia extension.

What percent A. 14 B. 7 C. 43 D. 12 Guanine is there in DNA sample #1?

Which kind of tissue sends messages from the brain to the rest of the body?

Samantha's job involves studying ecosystems and their components. Specifically, she deals with the population and growth of the organisms in the ecosystem. What's Samantha's profession? 1. conservationist 2. entomologist 3. population ecologist 4.

Which answer choice below BEST explains the difference between genotype and henotype? a) Ff is an example of a phenotype. White fur would be the genotype. b) Genotype can be represented by 1 allele.

Describe artificial selection, genetic engineering, and cloning.

Madison is looking st a cell under a microscope the organism had only one cell, and it has a nucleus and a memberane bound organelles. it has no cell wall and uses flagella for movement. in which kingdom should this organism be classified

When there is a well-established segment of heterochromatin on an interphase chromosome, there is usually a special barrier sequence that prevents the heterochromatin from expanding along the entire chromosome.

What does the theory of evolution tell us about living things? Group of answer choices The environment can make them change rapidly over a short period of time. They create fossils when they die. Their environment makes them change slowly over time.