Answer:
A. Fossil record
Explanation :
A fossil can be defined as any preserved element (e.g., bones, exoskeletons, shells, animal imprints) which can be used to demonstrate the existence of organisms from past geological periods. The totality of fossils accumulated in a particular area is referred to as the fossil record. The fossil record is very useful in geology and paleontology because the information provided by the fossils helps to place geological events and species in their corresponding geologic eras and periods.
Answer:
5) The parents phenotypeis tall because they are both Tt. The T is the dominant trait.
6)25% will be TT
-because only 1 of the four squares is TT
7) 50% will be Tt
- because 2 of the four squares is Tt
8) 25% will be tt
- beacuse 1 one 4 squares is tt
9) 75% of offspring will be Tall
- because T is domanint and 3 of the 4 sqaures has T
10) 25% of off pring will be short
-Because t is recesive and only 1 of the 4 sqaures has both tt. You need two recesive genes to have that trait
Hope this helps
Explanation:
Answer:
Organisims could be alike but be different species.
Explanation:
The correction option is A.
Reproductive isolation is divided into two major classes, which are prezygotic and postzygotic isolation. Prezygotic isolation refers to the barriers that are present before the egg can be fertilized while postzygotic isolation refers to those barriers that are present after the egg has been fertilized. Mechanical isolation is a type of prezygotic isolation. Mechanical isolation is a type of reproductive barrier which exist because the male and the female genitalia have different sizes, shapes and locations. The snails that coil to the left and those that coil to the right have the locations of their genitalia in different places.
Answer:
No.
Explanation:
No, we observe different number of ectotherms and endotherms in Arctic, and a dry desert ecosystems because there is difference in the temperature of both the environment. Due to difference in temperature of the external environment, the number of ectotherms and endotherms are present in that ecosystem. More number of ectoderms are present in the desert ecosystem where the ectoderms survive better than endotherms so we can say that number or population is different.