Which characteristic is present in marsupials but absent in reptiles?

Amniotic egg

Four limbs

Fur

Retractable claws

Why is evolution neither entirely fixed nor random

Algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. How does excess phosphorus get into fresh water? A) The nutrients are added to the water by fishermen to feed the fish.

Paraphrase the explanation of how a virus reproduces. why did the fact that hela cells are malignant make them particularly useful in the study of viruses?

Which lists the correct order of the steps? 1. water is broken down into oxygen and hydrogen. 2. glucose is broken down to be used by plants 3. hydrogen combines with carbon dioxide to form glucose 4. hydrogen enters the plant as part of water

What length of time does the geologic time scale cover? A. 2.0 million years B. 4.6 billion years C. 20.5 billion years D. 10.1 million years

The measurement of the distance from the crown of the infant's head to the infant's heel, while the infant is lying on his/her back with legs extended, is a measurement of:

How many pairs of autosomes does this karyotype have?

If a theory is challenged by new evidence, which of the following couod occur? A. the theory could be altered B. the theory is accepted, not the evidence C. the evidence is wrong D. a vote is taken to accept new evidence

Explain why different surfaces have different albedos.

Ab blood type is the universal blood recipient because of that type's lack of agglutinogens. ab blood type is the universal blood recipient because of that type's lack of agglutinogens. a. True b. False