gills structures in embryo Save Question 22 (2 points)t Which of the following animals is not a craniate? clam ray lamprey human being Save - Question 23 (2 points) Mammals evolved from birds.
Show transcribed image textgills structures in embryo Save Question 22 (2 points)t Which of the following animals is not a craniate? clam ray lamprey human being Save - Question 23 (2 points) Mammals evolved from birds.
The first coelomate animals are the _______________________________.
Nematoda
Platyhelminthes
Mollusca
Arthropoda
1 points
QUESTION 29
Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?
How can amino acids, simple sugars, and nucleotides be synthesized abiotically?
How did RNA sequences come to carry the code for amino acid sequences?
How could polymers involving lipids and/or proteins form membranes in aqueous environments?
How can RNA molecules act as templates for the synthesis of complementary RNA molecules?
1 points
QUESTION 30
The greatest number of endemic species is expected in environments that are _____.
easily reached and ecologically diverse
isolated and show little ecological diversity
isolated and ecologically diverse
easily reached and show little ecological diversity
1 points
QUESTION 31
A population of organisms will not evolve if _____.
all individual variation is due only to environmental factors
the environment is changing at a relatively slow rate
the population size is large
the population lives in a habitat without competing species present